Is Zero Even? - Numberphile

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  • Опубликовано: 7 ноя 2024

Комментарии • 7 тыс.

  • @justclosing
    @justclosing 8 лет назад +6047

    My bank account is even. It sounds better than saying you're broke.

    • @trunc8
      @trunc8 8 лет назад +26

      Hahah

    • @007RAJKOify
      @007RAJKOify 8 лет назад +86

      Its better then being in dept though.....

    • @justclosing
      @justclosing 8 лет назад +144

      -100.000 is even, or not?

    • @PongoXBongo
      @PongoXBongo 8 лет назад +56

      Even and negative.

    • @FirstLast-fr4hb
      @FirstLast-fr4hb 8 лет назад +5

      but its not negative, its zero. Negative is less than nothing.

  • @iammaxhailme
    @iammaxhailme 4 года назад +1216

    "I want to buy no sheep, I'll give you no pounds"
    That's the old school version. The 2000s version is "I want to buy no sheep, I'll give you no pounds plus a 10 pound processing fee".

    • @nathanilemiller7750
      @nathanilemiller7750 4 года назад +7

      What

    • @nanamacapagal8342
      @nanamacapagal8342 4 года назад +23

      Monthly

    • @deamonsamurai9760
      @deamonsamurai9760 4 года назад +44

      and another 10 pounds for wasting my time

    • @puppetsock
      @puppetsock 4 года назад +10

      If you don't understand "zero" I am not going to let you drive my car because you won't put gas in the tank.
      I'm pretty sure that farmers that over-wintered animals understood "nothing" as well. The stockpile of food for the animals and the other stockpile of food for the humans could get empty before spring. That would be a horrible disaster for the people depending on it. They either understood "running out" or they died. I don't believe this "didn't have the idea of zero" stuff. And empty plate, and empty cupboard, an empty barn, all of these were just other names for nothing.

    • @justsomeguy892
      @justsomeguy892 4 года назад +19

      @@puppetsock they obviously knew about nothing, but not in the mathematically useful sense, that's all.

  • @romanr9883
    @romanr9883 9 лет назад +1282

    that makes zero sense

    • @Proximity94
      @Proximity94 9 лет назад +80

      +Walwalkn Wewnrkl Lol, I can't even...

    • @samielsayed7445
      @samielsayed7445 9 лет назад +9

      +Proximity94 so zeros the odd one out kek

    • @TheLATbru
      @TheLATbru 7 лет назад +23

      You mean that makes even sense

    • @starknifez4846
      @starknifez4846 7 лет назад +12

      That's a very odd pun, even for me...

    • @christopherellis2663
      @christopherellis2663 7 лет назад +2

      It is very odd, that nothing is even, whereas something might be odd, or it might be even. 0/2=0/3, IF not please demonstrate.

  • @CaJoel
    @CaJoel 4 года назад +511

    The lack of ink in the marker deeply disturbs me

    • @ClickClack_Bam
      @ClickClack_Bam 4 года назад +12

      I'm ok with it because it's evenly out of ink in proportion with the level of ink it has.

    • @realeyes8199
      @realeyes8199 4 года назад +2

      *deeply*

    • @ratoim
      @ratoim 3 года назад +4

      "I find your lack of ink disturbing."

    • @azzteke
      @azzteke 3 года назад +1

      @@ratoim Why repeat?

    • @CarbonRollerCaco
      @CarbonRollerCaco 3 года назад +1

      That's how it should be with this topic: near-zero.

  • @DanZhukovin
    @DanZhukovin 7 лет назад +1883

    So zero is even. If you think zero is not even, then I cannot even, because that is too odd to believe.

    • @novaryx
      @novaryx 7 лет назад +64

      bruh

    • @stylus59
      @stylus59 7 лет назад +65

      Pass the blunt

    • @anandsuralkar2947
      @anandsuralkar2947 5 лет назад +4

      Hmm

    • @user-bb5bf2tp4w
      @user-bb5bf2tp4w 5 лет назад +19

      odd + odd = even (3+5 = 8, 7+11 = 18), 0 + 7 = 7 (odd!)

    • @avantika505
      @avantika505 5 лет назад

      @@user-bb5bf2tp4w I think it only works for natural numbers

  • @nerdbot4446
    @nerdbot4446 9 лет назад +357

    I once bought 0 sheep for 0 pounds. It made no sense, but it worked!

    • @ricv.8015
      @ricv.8015 6 лет назад +30

      I do it all the time actually

    • @sciencmath
      @sciencmath 6 лет назад +32

      It didn't make any cents, either.

    • @White-ul3dl
      @White-ul3dl 6 лет назад +12

      I see this comment posted 2 years ago, the first reply 2 weeks and the second reply 2 days
      Therefore 2+2+2=6
      My comment will be posted 1 second ago, the time it takes to refresh the page and find this comment again would be 5 seconds
      6-(5+1)=0
      0 is even

    • @Ghost____Rider
      @Ghost____Rider 6 лет назад +4

      You bought it from 0 farmers

    • @jocabulous
      @jocabulous 6 лет назад +7

      that's pretty odd

  • @ark9959
    @ark9959 6 лет назад +1755

    You don't have to use a telescope to film your videos

    • @northshorebuilt6364
      @northshorebuilt6364 4 года назад +23

      100 likes and not 1 comment. nuff said

    • @person8064
      @person8064 4 года назад +18

      128 likes and not 2 comments. nuff said

    • @Thebiggestgordon
      @Thebiggestgordon 4 года назад +71

      137 likes and not one person with a sense of humour. Nuff said

    • @jamespolland958
      @jamespolland958 4 года назад +25

      144 likes and no cats :( nuff said

    • @Ahmet-fg4ul
      @Ahmet-fg4ul 4 года назад +17

      196 likes and no jokes. Nuff said.

  • @TroutOfOrder
    @TroutOfOrder 5 лет назад +234

    I remember as I child someone in school told me that there are numbers less than zero, and I almost didn't believe them. They said "yeah, they're called 'negative numbers'" and I was in shock

    • @nickwilson3499
      @nickwilson3499 4 года назад +25

      Makes sense since negativity is basically just an abstraction. There’s no such thing as a negative number in our natural world.

    • @mcvibing2785
      @mcvibing2785 4 года назад +32

      @@nickwilson3499 I cant have negative 6 sheep, or negative 10 apples. the closest thing would be debt

    • @nickwilson3499
      @nickwilson3499 4 года назад +11

      @@mcvibing2785 exactly what I was saying. Debt is just saying “when you have more sheep, give some to me.” It’s just in your head, it doesn’t actually exist.

    • @mcvibing2785
      @mcvibing2785 4 года назад

      @@nickwilson3499 yeah

    • @BPEREZRobertJamesL
      @BPEREZRobertJamesL 4 года назад

      F=-kx is Hooke's Law. What do you say?
      Oops, it's just a model.

  • @Thaplayer1209
    @Thaplayer1209 8 лет назад +2060

    I found it odd to call 0 even

  • @aramoticy
    @aramoticy 7 лет назад +612

    This is the first time I've heard a bunch of Brits use the word "zero" so often. Usually, I hear "nought"

    • @pendlera2959
      @pendlera2959 5 лет назад +184

      You mean zero is naught so common?

    • @zappycrook1130
      @zappycrook1130 4 года назад +1

      24kGoldenRocket stfu

    • @Darklor_WCF
      @Darklor_WCF 4 года назад +21

      @@24kGoldenRocket zed refers is an alternative pronunciation of the letter z instead of saying "zee"

    • @TC_83
      @TC_83 4 года назад +41

      IronCoreGroup “zee” is the alternative pronunciation, not “zed”. The entire English speaking world says “zed”.... only the Americans say “zee”

    • @seabassthegamer6644
      @seabassthegamer6644 4 года назад +25

      @@TC_83 Which pronunciation is alternate is relative. That's not special though, just about everything is relative.

  • @briannalove749
    @briannalove749 7 лет назад +103

    I honestly always thought zero was even because of when I was like six and we would line up in pairs at school, I concluded that zero was even because odd numbers always have someone left out with pairs, but even numbers don't, and since 0 doesn't have anyone left out it must be an even number.
    Now that can just be said as "divisible by two"... I love the way my brain worked

    • @michaelhanford8139
      @michaelhanford8139 2 года назад +7

      Brilliant!
      ...all i got from pairing up was traumatized🤷😆

    • @PC_Simo
      @PC_Simo Год назад +7

      @Brianna Love Well, in Finnish, the word for ”odd number” is: _”Pariton Luku”_ (lit. ”Pairless Number”), and for ”even number”, it’s: _”Parillinen Luku”_ (lit. ”Paired Number”). 😅🇫🇮

    • @PC_Simo
      @PC_Simo Год назад +4

      @@michaelhanford8139 Like getting picked last to the team, in PE.

    • @pepe6666
      @pepe6666 Год назад +1

      @@PC_Simo you can be pair with ...the teacher! ...:( thats me at school

    • @PC_Simo
      @PC_Simo Год назад +1

      @@pepe6666 It could have been me, just as well; and probably would have been, if being pair with the teacher had been a thing, for us. My sympathies. :(

  • @sarahb2425
    @sarahb2425 4 года назад +200

    0:01 me on my maths results day

  • @jangofet555
    @jangofet555 10 лет назад +19

    1 2 4 8 7 5 what do these have in common? what does 3 and 6 have in common? and why is 9 the only number that always reduces back to 9 from multiples of it self? ie 9x4 = 36 3+6=9 or 9x52743=474687 4+7+4+6+8+7=36 3+6=9.

  • @fingernailclipper2152
    @fingernailclipper2152 5 лет назад +92

    "0. That's our friend."
    Same
    [Insert sad violin music]

    • @omikronweapon
      @omikronweapon 5 лет назад +3

      Hello Zero, my old friend.

    • @benedictifye
      @benedictifye 4 года назад

      One, is the loneliest number

    • @hamster8706
      @hamster8706 4 года назад

      0. Thats our friends
      0 thats our friends
      Points give you friends

  • @narcoleptic8982
    @narcoleptic8982 6 лет назад +467

    Question: Is zero even?
    Answer: No, it’s naught.

  • @MonsterTeegs
    @MonsterTeegs 4 года назад +337

    Magic the Gathering players: I've been training my whole life for this moment.

    • @mn6334
      @mn6334 4 года назад +3

      I was about to make a similar comment...

    • @BarginsGalore
      @BarginsGalore 4 года назад +17

      *void winnower has entered the chat*

    • @thydevdom
      @thydevdom 4 года назад +20

      I don’t play but I’m curious what you mean with your comment. Lol. Care to explain?

    • @BarginsGalore
      @BarginsGalore 4 года назад +47

      Dominik Brame some magic the gathering cards reference odds and evens and on every card that mentions them they say that zero is even. It’s kinda become a joke I’m the community

    • @Dexaan
      @Dexaan 4 года назад +11

      (Zero is an even number)

  • @scottpoet
    @scottpoet 8 лет назад +276

    I find it odd that we are even talking about this.

  • @SternLX
    @SternLX 7 лет назад +81

    When he mentioned Divide by 0, I immediately imagined a spread sheet covered in #DIV/0!

    • @Mullkaw
      @Mullkaw 5 лет назад +3

      you poore soul

    • @coleabrahams9331
      @coleabrahams9331 3 года назад

      I imagined a y=1/x function and how there is an asymptote at x=0

    • @PiyushSharma-hy2ej
      @PiyushSharma-hy2ej 3 года назад

      That's 0!, so that will work cause it's 1

  • @ssgoko88
    @ssgoko88 8 лет назад +650

    0 is one less than a non-even number. Ergo it has to be even. Wheres my nobel prise.

    • @elliotgale470
      @elliotgale470 8 лет назад +28

      7 is less than an infinite number of non-even numbers. Ergo it has to be even. Where's my prize?

    • @elliotgale470
      @elliotgale470 8 лет назад +2

      ***** exactly, thank you for noticing

    • @ButtonMasherReal
      @ButtonMasherReal 8 лет назад +81

      2 / 2 = 1, so 2 is even
      10 / 2 = 5, so 10 is even
      0 / 2 = 0, so 0 is even
      The pattern is that they all become whole numbers when divided by two. Nobel Prize now.

    • @seangrand3885
      @seangrand3885 7 лет назад +42

      Doktor Karlos Mathematicians do not get a Nobel Prize, you know...

    • @PsychShrew
      @PsychShrew 7 лет назад +40

      Elliot Gale He said ONE less.

  • @markusjacobi-piepenbrink9795
    @markusjacobi-piepenbrink9795 4 года назад +295

    "Is zero even … a number?"

    • @neverrip6809
      @neverrip6809 4 года назад +10

      Nope.. it's sort of not a number... -1, -2, -3 are counting backwards, +1, +2, +3 Is counting forward.... 0 has neither a + or -. Zero belongs at the start of an equation like a capital letter ie
      0+6/+2+(0+1+2)=
      0+1. I'd say people have lost their mind with maths, but maybe they never had it.

    • @cgiunta6542
      @cgiunta6542 4 года назад +28

      Yes, according to my programming language.

    • @neverrip6809
      @neverrip6809 4 года назад +5

      @@cgiunta6542 yea, der, I know. Binary code is different to maths. I stick to maths tho.

    • @sandeepbannore4185
      @sandeepbannore4185 4 года назад +9

      @@neverrip6809 zero is a number.

    • @amzwl1671
      @amzwl1671 4 года назад +15

      Alex Prangnell / Binary is a base 2 counting system. It is still very much maths haha

  • @invalide
    @invalide 8 лет назад +911

    Is zero even what??????????
    It's 3 am and I haven't slept in a day

    • @invalide
      @invalide 8 лет назад +1

      tephine 726 ???? Wat ????

    • @199022009
      @199022009 8 лет назад +10

      Zero can.

    • @nicolasanese6499
      @nicolasanese6499 8 лет назад +23

      This comment is odd.

    • @want-diversecontent3887
      @want-diversecontent3887 7 лет назад +3

      MrBlueSky Is zero even a number divisible by two and can be added by two numbers and can be added with another number that is not divisible by two and become a number that is not divisble by two?

    • @SPFAlpha
      @SPFAlpha 7 лет назад +4

      Invalide_Account meth... helluva drug

  • @MrAffeman
    @MrAffeman 10 лет назад +44

    If you have nothing, nothing it is, but something put in front of nothing makes something that has nothing behind it.

  • @Farmeryeti
    @Farmeryeti 9 лет назад +206

    I thought 0 being even was common knowledge? And I'm awful at maths.

    • @MasterOfTheChainsaw
      @MasterOfTheChainsaw 9 лет назад +46

      Farmeryeti I think that most people intuitively thinks of 0 as even, but after learning more about 0 and how it acts in a weird way in many cases, like how 0 is neither positive nor negative, and how you can't divide by 0, some people might start to question whether 0 is actually even or if it's neither even nor odd. Apparently it does fit in well with the even numbers though.

    • @jonathanpark4619
      @jonathanpark4619 9 лет назад +2

      MasterOfTheChainsaw It's because even numbers are defined as anything that is equivalent to 0 mod 2. Nothing really deeper than that.

    • @jonathanpeck
      @jonathanpeck 9 лет назад +2

      Jonathan Park Somewhere in the galaxy, we have the same name!

    • @jonathanpark4619
      @jonathanpark4619 9 лет назад +2

      Jonathan Peck !!! Hahhaa

    • @columbus8myhw
      @columbus8myhw 9 лет назад +3

      Farmeryeti My sixth grade math teacher didn't know this. I was very surprised.

  • @Liggliluff
    @Liggliluff 4 года назад +58

    I wouldn't have a delayed reaction if someone asked me if zero was even, and this video helps me be even more sure about my answer. - But I might be the odd one out.

    • @li_ka2
      @li_ka2 4 года назад +1

      I think I would have. Zero is a weird number that kinda follows it's own rules (you can't divide by it, anything multiplied by it is zero, stuff like that) and if you're asking me that I will assume you're tricking me (like asking "is a banana a berry")
      Ps: swede?

  • @Sovnarkom
    @Sovnarkom 10 лет назад +179

    I have $0. Must be the devil's work.

  • @Liggliluff
    @Liggliluff 4 года назад +103

    Brady's logic to even numbers, if they're round. So let's list them:
    Even numbers; 0, 3, 6, 8, 9
    Odd numbers; 1, 4, 7
    2 and 5 are both odd and even; Odven? Evedd?

    • @akberjag
      @akberjag 4 года назад +2

      8 is even EVEN..

    • @oz_jones
      @oz_jones 3 года назад +5

      @@akberjag even Steven

  • @harleyspeedthrust4013
    @harleyspeedthrust4013 7 лет назад +189

    "I feel like the answer is no but it feels like it is because it's round"
    Secretly, we all feel the same way

  • @noahburns6042
    @noahburns6042 2 года назад +1

    Also, algebraically, an odd number is a number that gives a whole number when doubled and minus or add 1:
    2n-1 is odd, and so is 2n+1
    Let's say, for 0 to be odd
    2n - 1 = 0
    2n = 1
    n = 1/2,
    but because n in this case isn't a whole number, in fact halfway between, 0 can't be odd, so is even.
    Moreover, using the same calculation, an even number will always be something and a half, for example
    2n - 1 = 2
    2n = 3
    n = 1 and 1/2
    2n + 1 = 10
    2n = 9
    n = 4 and 1/2

  • @lomax343
    @lomax343 9 лет назад +31

    Slightly at a tangent, grammatically-speaking zero is plural. Consider -
    "There are two cups on the table" - Plural
    "There is one cup on the table" - Singular
    "There are no cups on the table" - Back to plural

    • @anon3988
      @anon3988 9 лет назад +4

      This is relevant how? That is a grammatical caveat and nothing really to do with maths.

    • @lomax343
      @lomax343 9 лет назад +18

      I did say I was going off at a tangent...

    • @micahvalentine4878
      @micahvalentine4878 9 лет назад +4

      +lomax343 Grammatically speaking, so are decimals. on average, households in the US have 1.7 toasters.

    • @Oxy456
      @Oxy456 7 лет назад +10

      There is no cup on the table.

    • @Deluxeta
      @Deluxeta 7 лет назад +1

      That implies there was supposed to be one.

  • @stumbling
    @stumbling 9 лет назад +449

    Does zero even even?

  • @KaitouKaiju
    @KaitouKaiju 8 лет назад +758

    Zero literally can't even

    • @AveLudusMagnus
      @AveLudusMagnus 8 лет назад +29

      I just came here to make that joke, but you already did. Thanks

    • @shadycharlotte9144
      @shadycharlotte9144 8 лет назад +42

      SentsuizanXS Actually it literally can't odd.

    • @anandsuralkar2947
      @anandsuralkar2947 5 лет назад

      It makes me feel odd

    • @ShelliLoop
      @ShelliLoop 5 лет назад

      Does your native language have "odd, even, zero...."? I think you are buggering English. Try rewriting your comment so it makes sense?

    • @danithegoat1416
      @danithegoat1416 5 лет назад

      I am the 666th like

  • @ArgyleAdams
    @ArgyleAdams 4 года назад +2

    For base 10: Every number with an even digit in the ones place is even. Every number with an odd digit in the ones place is odd. Every number with a zero in the ones place is even. QED zero is even.

  • @anaunaga5471
    @anaunaga5471 8 лет назад +194

    My favorite number is 8 because it can be divided physically and mathematically, and can be cubed

    • @kylebrainpresents
      @kylebrainpresents 8 лет назад +4

      PiZzA ZiZa wait what is 7 a common favorite number?

    • @anaunaga5471
      @anaunaga5471 8 лет назад +9

      *****
      8 just has that special feel to it, and it is a common number in computing

    • @abadlydrawnsnowman1648
      @abadlydrawnsnowman1648 8 лет назад +28

      My new fav number is -1 because
      e^iπ=-1

    • @GhostInTheShell29
      @GhostInTheShell29 8 лет назад +4

      My issue with negative one is its root is imaginary.
      And something tangible coming from something imaginary :p causes a lot of headaches in a philosophical sense.

    • @jmcwd
      @jmcwd 7 лет назад +17

      My favourite number is 256, because it is 2^8, or the amount of numbers you could have in 8-bit binary.

  • @Sjackson2369
    @Sjackson2369 7 лет назад +11

    Another thing you could say is that two odd numbers added together will make an even number, but when adding zero to an odd number it remains an odd number

  • @sereysothe.a
    @sereysothe.a 9 лет назад +19

    CORRECTION:
    al-khwarizmi was from modern day uzbekistan (then part of persia), and he did his studies in baghdad

    • @columbus8myhw
      @columbus8myhw 9 лет назад

      ***** He even said "Al-Khwazimi." Which sounds... weird.

    • @mustafatalaeezadehkhousani4856
      @mustafatalaeezadehkhousani4856 9 лет назад +9

      namn Just to add that we have "Algebra" thanks to his works in this field and unknowns (he'd call them Filān_x_ and Bahmān _y_) in his book Ilm al-jabr wa'l-muḳābala.

    • @listocalisto8124
      @listocalisto8124 9 лет назад +1

      The persians found out a lot of things of todays science

    • @sereysothe.a
      @sereysothe.a 9 лет назад +4

      Shashank Jaiswal well, khwarizmi didn't claim to invent anything. but instead his book was an in depth study that used greek, indian, and babylonian mathematics and *built on it with his own techniques.* also, while only certain rules of quadratic equations were defined in india and greece, it was his book that clearly brought together the knowledge and set the foundation for what we have today.

    • @sereysothe.a
      @sereysothe.a 9 лет назад

      Shashank Jaiswal the real hero is omar khayyam

  • @CinematicLaboratory
    @CinematicLaboratory 4 года назад +1

    Yes, it's the ultimate even number. Zero is the most important number in mathematics. It's the origin of the Universe. The here and now. The center of future and past. The only spot in the universe we can be absolutely sure about and we're always right in the middle regardless of where we think we are.

  • @skpcboy
    @skpcboy 10 лет назад +9

    1 is odd, 1 + *2* = 3
    3 is odd,
    and...
    2 is even, 2 + *2* = 4
    4 is even,
    so....
    2 - *2* = 0
    simple theory :)

  • @WtbgoldBlogspot
    @WtbgoldBlogspot 8 лет назад +207

    Just so y'all know, the word for "Fiveness" is quincunx.

    • @EchoHeo
      @EchoHeo 6 лет назад

      WTBGold
      Kwingcungs

    • @MunkiZee
      @MunkiZee 6 лет назад

      No, it's an abstract idea

    • @jaspermay5813
      @jaspermay5813 6 лет назад +7

      Quincunx means 5/12 of an inch (uncia) or the pattern of 5 dots e.g. on dice. I think a Latinate word for 'fiveness' could be 'quinquity'.

    • @gianfrancoAA
      @gianfrancoAA 5 лет назад +1

      No

    • @oz_jones
      @oz_jones 5 лет назад +3

      No it's not. It's _fiveness_

  • @greedowins
    @greedowins Год назад +1

  • @wethdtdi
    @wethdtdi 8 лет назад +57

    i dont understand much about math, but i think looking at the numbers that even number is a number between two odd numbers.. so 1 and -1 are odd.. 0 must be even :)

  • @waffleless
    @waffleless 7 лет назад +41

    *draws a wide circle*
    "Zero!"
    ...
    You what?

    • @avi8aviate
      @avi8aviate 3 года назад

      It's a 0 on its side.

  • @MrAffeman
    @MrAffeman 10 лет назад +12

    Zero is a representation of nothing. But nothing can be something with something in front of it.

  • @Rhovanion85
    @Rhovanion85 3 года назад +26

    6:12 This is interesting. As a software engineer who uses Oracle databases you actually have a value called NULL which means "nothing". If a value is NULL it acts completely different when used in operations than a value 0, which is numeric. A string of text for instance that is not saved can be NULL, but it cannot be 0. Multiplying by NULL also returns NULL , like zero, but If you add a value to NULL you will also still have NULL. If you divide by NULL you will have NULL as well. in logical operators such as "equals to" it gets even weirder. if you have a branch in a function for instance "if variable = NULL" the expression will alwayus be false, even if the variable contains value NULL. if you have 2 variables, and both are NULL and you ask "if var1 != var2" (!= means "not equal to") it is also FALSE. an operation with NULL does not only always return NULL, it is not even equal to... itself.

    • @Lhorez
      @Lhorez 2 года назад +5

      Null as implemented in many programming languages doesn't mean nothing. It means (essentially) "I don't know". That's why nulls propagate. A simple example: If I say "1 plus something equals what?" You'd probably ask "What is something?". I'd shrug my shoulders and you'd then say. "I don't know." 1 + NULL = NULL. Multiplying or dividing by 0 is a bit trickier though so the explanation isn't as clean as this.

  • @gioschrijver5683
    @gioschrijver5683 8 лет назад +74

    Not positive nor negative. Neutral?

  • @MrJonndoe
    @MrJonndoe 4 года назад +4

    1:50 a little correction, Al Khorezmi was the founder of modern Algebra and algorithms. The word Algebra is taken from this scholar, and he was not from North Africa, he was from Central Asia. Khorezm, which is currently in the territory of Uzbekistan.

    • @drshafat4219
      @drshafat4219 2 года назад

      Came here the guy who believes books came from SKIES

  • @gdub454
    @gdub454 10 лет назад +5

    My friend asked me one time "What is one of the greatest discoveries?"...of course..I said electricity(which is an obvious one)...he then tripped me out with the discovery of zero...what is great irony w/ zero is even though by itself zero = nothing...put it next to a 1 - 9 #...and it makes its sum larger...that is the best case of irony I can think of...

  • @r.6685
    @r.6685 4 года назад +2

    Answer at 1:25

  • @arckocsog253
    @arckocsog253 8 лет назад +54

    In casinos, 0 is neither odd nor even.

    • @AClarke2007
      @AClarke2007 8 лет назад +1

      +Arc Kocsog Casinos also use "00" too!

    • @dongryeongkim9828
      @dongryeongkim9828 8 лет назад

      +Arc Kocsog lol

    • @kimjongdavidsothesexymugba1138
      @kimjongdavidsothesexymugba1138 8 лет назад +1

      +Warrior Son wtf

    • @adamledger6836
      @adamledger6836 8 лет назад

      +Arc Kocsog this is correct

    • @sanderd17
      @sanderd17 8 лет назад +11

      +Arc Kocsog The only reason for that is to make profit for the casino. When you bet on even, and it's correct, you get to double your money. But there are 18 even, 18 odd and one zero on the board IIRC (37 possible outcomes in total).
      So if you put M euros on it, the average amount you get back is: (18/37) * 2M + (19/37) * 0 = 36M/37. So on average, you always get less back than you put into it, and the 1/37 left over is the profit for the casino.
      Another way to visualise it: say there are two persons gambling, one always puts €10 on even, the other puts €10 on odd. For most runs, the result would be even or odd, and the casino wouldn't gain or lose anything. But for on average 1 in 37 runs, the outcome will be a zero, and the casino will get the complete pot of that run.
      The only way to win with the roulette, is to not play it often. When you play it only a few times in your life, the final result will not get the chance to average out (and hopefully to your advantage).

  • @antimaster6432
    @antimaster6432 8 лет назад +33

    can you guys explain the fundamental maths on sin, tg, cos and ctg?

    • @prateekgurjar1651
      @prateekgurjar1651 8 лет назад +6

      they are just ratios...and I guess it would be a boring video

    • @DommHavai
      @DommHavai 7 лет назад +4

      Wiki can reveal this mystery for you.

    • @prateekgurjar1651
      @prateekgurjar1651 7 лет назад +14

      Thinking again, that would be a nice history video if they show how they were developed.

    • @coolguy284_2
      @coolguy284_2 5 лет назад

      (tg is usually abbreviated tan)
      i mean, they are all related to the x and y coordinates of points at a specific angle on a circle (sin and cos) and on a tangent line that intersecs the x-axis(tan and cotan)

    • @angelmendez-rivera351
      @angelmendez-rivera351 5 лет назад +1

      coolguy 284 If you are talking about the modern definition, sure, but the historical origin is far more complicated than this. In reality, what happens is that you draw a circle and then a triangle using a central angle. There are many limes that have some special relationship to the circle, e.g a tangent line or secant line. The ratios are then defined in terms of how the special line is parametrized by the angle and the radius of the circle. Only a few of these ratios are taught today, though, which are the sine, cosine, tangent, cotangent, secant, and cosecant.

  • @Iam1nsane
    @Iam1nsane 11 лет назад +4

    I have a question though. 0/2=0 & 0/3=0. So then, 2=3? I am saying this because that is how, division by zero aint possible and not equal to infinity was explained. Although keen at maths too, i have always considered zero as even but after watching this video, i am actually having some doubts. lol. Nice vid BTW.

    • @justabunga1
      @justabunga1 4 года назад

      They are both to zero. The contradiction here is when you divide 0 by 0 since it's indeterminate. Anytime when you divide by zero, it is always undefined. Both of these statements when you get into calculus can be used in terms of limits. 0/0 is one of the indeterminate forms where you have to do more work using either algebraic method or l'Hopital's rule. 1/0 may have the limit to no exist or going to positive or negative infinity depending on the function assigned.

  • @andrerenault
    @andrerenault 3 года назад +1

    I like the format of this and the root 2 video. Two different presenters giving different talks about the same topic, interwoven.

  • @andrestricker4118
    @andrestricker4118 5 лет назад +7

    Bubbleonians.
    There are many reasons to love Numberphile, the accent is one of them. Thanks for explaining

  • @pranavlimaye
    @pranavlimaye 4 года назад +3

    This is such a great video, I can't even!!!

  • @jonathan3504
    @jonathan3504 8 лет назад +85

    Al-Khwarizmi (or Al-Juarismi) was not established in North Africa: he lived and worked in Bagdad in the IX century and is mostly famous for his compilations and contributions to Algebra (he gave its name to this branch of maths) and Arithmetics among others.

    • @shaamyl6856
      @shaamyl6856 8 лет назад +14

      If you are not an Indian and not a Hindu, than how can you make such a funny comment :) No one stole anything from India, Muslim scientists were dominant in India as well sir :)

    • @shaamyl6856
      @shaamyl6856 8 лет назад +4

      Lol, wasn't a joke, it was the truth, you can research the timeline quite easily

    • @arjungajra684
      @arjungajra684 8 лет назад +1

      __I__ haha

    • @mridul303
      @mridul303 8 лет назад +15

      +Shaamyl Anwar Islam came to India at around 700 AD. Aryabhatta used 0 as number at around 500 AD.

    • @shaamyl6856
      @shaamyl6856 8 лет назад +5

      Yes Mridul, I never talked about the use of 0 only, just Al-Khwarizmi's contributions to Maths generally

  • @carolstott5337
    @carolstott5337 Год назад +1

    I love these videos. They make my brain hurt, yet I somehow understand them...

  • @michaelstrickland9736
    @michaelstrickland9736 8 лет назад +8

    I've always seen zero as "genderless," unless a larger number ends in zero. Then the zero makes that number even.

  • @HDitzzDH
    @HDitzzDH 5 лет назад +4

    I always thought it was obvious that 0 is even, if you have an even number and subtract/add 2 your new number will also be even, so if we start at 8 which is even, then subtract 2 = 6 (even), subtract 2 = 4 (even), subtract 2 = 2 (even), subtract 2 = 0 (even?)

  • @Liravin
    @Liravin 4 года назад +36

    6:13 it would make more sense to me if he finished by saying "nothing is when there's nothing to count - zero is the absence of something"

  • @dharmendrkrishnia955
    @dharmendrkrishnia955 5 лет назад +1

    If we multiply the equation ax^2+bx+c=0 by( -1) then here if we cosider 0 as a negative integer then there is no problem ! And if be consider it to be positive then also no problem so 0 should be both positive and negative hence it is placed batween the number line what do you think numberphole?

  • @markdstump
    @markdstump 9 лет назад +14

    Well, zero IS congruent to 0 Mod 2, which would be my definition of "even." :)

    • @kdbacho
      @kdbacho 9 лет назад +1

      Mark Stump I think you mean 0 is congruent to 2 (mod 2), as congruence works like this, if a mod c = b mod c then a is congruent to b (mod c). You are right in saying 0 is congruent to 0 (mod 2) but it is also congruent to 0 (mod 3) or 0 (mod 5) etc. Just wanted to let you know :)

    • @kdbacho
      @kdbacho 9 лет назад

      Mark Stump Thank you for clearing up the misconception. I thought you meant if for all natural numbers x, if x is congruent to x (mod 2) than it is even. Now I see you meant if for all natural numbers x is congruent to 0 (mod 2) than it is even, which is correct. Although you could have made your definition even better by just saying if x mod 2 = 0 than x is even, which is the same as both your's and
      Brady's definiton. :) And I do think 0 is even because it is a multiple of 2. Its kind of interesting to see whether people choose division or multplication to define even/odd numbers.

    • @markdstump
      @markdstump 9 лет назад

      Jeevan Devaranjan
      It's the same congruence class and the same set of integers!
      Still, you had me worried for a few seconds: I'm old and senile, but I know how it works.
      I'm saying if "a" is congruent to 0 mod 2, it's even. (My proposed definition)
      If you think this definition fails, show me an "a" that is congruent to 0 mod 2, but isn't even...
      or show me an even number that is not congruent to 0 mod 2.
      I said nothing about congruency to 0 mod 3, 4 or 5...
      if we did have the word "threeven," of course I'd want a similar definition and I'd want to include 0 again...so it'd be even AND threeven. This doesn't bother me; I don't think it should trouble you. Surely you don't think 0 should be considered throdd!?

  • @cloudybrains
    @cloudybrains 8 лет назад +184

    I can't even

  • @lisantica842
    @lisantica842 6 лет назад +4

    I enjoy your videos. If zero is neither positive or negative, can it also be said that it is equally positive and equally negative?

  • @nicklang7670
    @nicklang7670 3 месяца назад +1

    I love this video. To know the number zero was causing people who abuse power to lose power over and over and the story of zero becomes a great historical philosophy that needs to be told well!

  • @KingFredII
    @KingFredII 8 лет назад +32

    I fail to see the problem. I didn't need a split second: yes, zero is even.

    • @EGarrett01
      @EGarrett01 8 лет назад +6

      All you've done is advertise that you're an idiot who clicks on videos that address things you already know.

    • @KingFredII
      @KingFredII 8 лет назад +8

      +EGarrett01 No, I click on Numberphile videos because they're interesting. You just called yourself an idiot by not understanding that obvious fact.

    • @KingFredII
      @KingFredII 8 лет назад +1

      +EGarrett01 Why not? He also said if you add up positive integers you end up with -1/12. Now one more insult from you and I'm going to report you which might lead to termination of your Google account. In other words: shut up!!!

    • @EGarrett01
      @EGarrett01 8 лет назад +4

      Now that I've pissed in your cheerios, buh-bye.

    • @Heligoland360
      @Heligoland360 8 лет назад

      +EGarrett01 Well that was a pleasant conversation.

  • @frankdipaulo655
    @frankdipaulo655 6 лет назад +3

    When i saw the title, just thought "is zero even, WHAT ArE YoU HiGh?" lol!

  • @achadel6293
    @achadel6293 10 лет назад +57

    All numbers are odd. Even numbers are just a conspiracy.

  • @suspectdown5133
    @suspectdown5133 5 лет назад

    Could the right half of 0 be positive and the left half be negative ? Or top half positive and bottom half negative ? Or.....
    aditya aggarwal
    1 week ago
    Whenever an even number is subtracted from an even number, the difference is always an even number.
    Eg. 4-2=2 or 8-2=6
    So, by that logic, isn't 2-2=0 also even?
    BTW, I typed this comment before watching the video.
    Simple thinking IMO.

  • @Mayhamsdead
    @Mayhamsdead 4 года назад +9

    "Is Zero Even?"
    "When counting, is the number next to an odd number?" - if the answer is < yes > , regardless of what number you're talking about, the number is even.

  • @MrNutter
    @MrNutter 10 лет назад +48

    Zero is infinitely zero.

  • @SpectatorAlius
    @SpectatorAlius 10 лет назад +11

    The answer to the question is, 'yes'. Zero is an even number. Otherwise the set of even numbers would not be closed under addition (subtraction). Why he needed nearly seven minutes to explain this is beyond me.

    • @galaxybounce1002
      @galaxybounce1002 9 лет назад +7

      Because the explanation is what people are interested in.

  • @hubb8049
    @hubb8049 5 лет назад +1

    Also, if you have an even number of negative numbers in multiplying/dividing then the answer is positive
    Example: 4*(-5)=(-20) because there is 1 negative number and 1 is odd
    (-7)*(-3)=21 because there are 2 negatives etc.
    7*3=21 because there is 0 negative numbers and therefore 0 is even

  • @savannahritz3473
    @savannahritz3473 11 лет назад +54

    Can you translate this in a third grade fashion ?

    • @darksidecola4529
      @darksidecola4529 7 лет назад +9

      0 is between 1 and -1 , which are odd, so 0 is even.

    • @jawsome1185
      @jawsome1185 7 лет назад +1

      Also, 0/2 has no remainder. Odd numbers divided by 2 have a remainder. 0 has to be even then.

  • @851852093114208513
    @851852093114208513 10 лет назад +18

    ...but CAN zero even?

    • @justabunga1
      @justabunga1 4 года назад

      Yes, he is referring to an even number.

  • @B3Band
    @B3Band 9 лет назад +42

    Is zero even what?

    • @StrzelbaStian
      @StrzelbaStian 8 лет назад +2

      +Bloodbath and Beyond What is this? I don't even.

    • @matthewlewiscomposer
      @matthewlewiscomposer 8 лет назад

      Of course

    • @planetjanet3845
      @planetjanet3845 8 лет назад +1

      +Strzelba Stian I can't even

    • @yadroi
      @yadroi 5 лет назад

      Don't be a zero, get even!

    • @justabunga1
      @justabunga1 4 года назад

      He is referring to an even "number". 0 is an even number. 0 is also considered to be both "even and odd function".

  • @richardlinsley-hood7149
    @richardlinsley-hood7149 6 лет назад

    O is only a number in Integers and Reals. Not in Natural, Fractional or Harmonic, which all have 1.
    Small question for you, as 1 is a number , is -1 a number or a vector?
    0=1(-1)
    Vectors 'balance' around 0
    Numbers 'balance' around 1
    See Newton
    Law
    1. Sets the origin
    2. Sets the magnitudes
    3. Sets the vectors
    See?

  • @mizuhonova
    @mizuhonova 7 лет назад +5

    As the great Randy Savage once said, "Nothing is nothing". He was the cream of the crop.

    • @davidm4547
      @davidm4547 3 года назад

      I'm with you on that. It's hard to pin qualities on nothing.

  • @Bloodmoon17
    @Bloodmoon17 11 лет назад +6

    What the hell is with this thing about Babylonians and Greeks using a "space" to differentiate between the numbers 26 and 206? The Greeks used a alphabet-based numeric system, much like Roman numerals, but with the Greek's ancient alphabet instead. They often times used obsolete letters or isolated symbols instead. They did not write it like the numerals we used. With that, I can hardly believe anything else in this video, as a lot of it is based upon the whole "space between numbers" shite.

  • @casperv5270
    @casperv5270 4 года назад +3

    it always seemed intuitive to me that zero is even, because 0 % 2 = 0, after dividing it with 2 there is no remainder.

  • @kanakTheGold
    @kanakTheGold 2 года назад +1

    Loved how to topic progressed from
    Is 0 even a number?
    to
    Is 0 an even number?

  • @asb8686
    @asb8686 3 года назад +2

    I never get to finish my math homework and I literally have never gotten higher than a C for math. Yet I do like to watch these videos

  • @bobmichaelsen2891
    @bobmichaelsen2891 8 лет назад +25

    Zero is even! Just look at the reminder text of Void Winnower! (MTG Joke)

    • @thedarklight6752
      @thedarklight6752 8 лет назад

      wow

    • @SuperKako17
      @SuperKako17 6 лет назад +1

      Please don't explain the reference when making geeky jokes. The whole point of it is to make it funny only for those that are worthy.

  • @spiewajit4ncz
    @spiewajit4ncz 5 лет назад +33

    zero is dividable by two, so it's even. where's the problem?

    • @factsverse9957
      @factsverse9957 5 лет назад

      Roulette

    • @Kokurorokuko
      @Kokurorokuko 4 года назад +2

      Aravind Suresh what that has to do with the topic?

    • @spiewajit4ncz
      @spiewajit4ncz 4 года назад +1

      @lygophile That's correct, but what does it change? The number being even is not about ending up with 2. By definition, it's about being integrally divisible by 2. And 0 is.

    • @larsmaurer6738
      @larsmaurer6738 4 года назад +1

      @lygophile "isn't that an equally valid definition of 2, that it has a prime factor 2?"
      No. It's no equally valid definition because zero wouldn't be even then. ;-)
      "no even number starts with the letter "z" ... zero does!" - just joking :-)
      What is the correct definition for an even number?
      - It is divisible by 2. 0? Yes. This is the definition that can be found on Wikipedia.
      - It leaves no rest when divided by 2. 0? Yes.
      - It is a multiple of 2 and another integer. 0? Yes. (no prime factorization here....)
      What is the alternative?
      odd = not even (this is the literal definition)
      As all integers are either even or odd, then zero would have to be odd.
      even * odd = even .....will not work then. ;-) bad things will happen.
      fun fact...
      If there was a word for a number being divisible by 3 - let's say "threven" - zero would be threven, too.
      (Sorry for bad English, I don't think that automatic translations can handle mathematical subtleties.)

    • @pashimanu0073
      @pashimanu0073 3 года назад

      @lygophile whether zero is even or odd??haha There is no point of arguing about it because zero is even by definition and not by any logic. For example, composite numbers are composite numbers by definition if the definition was like "a composite number has at least 1 factor(say)" then we would say that 0,1,2,..are composite. These rules and definitions are made by humans and not by nature 😂.
      @Lars Maurer has stated the definition of even numbers above. Read it. If the definition have any such point which you have said (can't divide it by any no. to get 2) then it will definitely be excluded from the list of even no.s

  • @christopherellis2663
    @christopherellis2663 4 года назад

    1: it is an absence of number
    2: 0+x is the presence of number
    3: 0-x is a deficit of number
    4: zero is the border between deficit and presence.
    For example, 10 is an absence of units; 101 is the absence of tens;
    5: x/0 some part of nought.
    0/x no part of something
    0/0 no part of nought.
    6: if the logic alludes you, try adjusting your theoretic. 🧙‍♂️🛂🎭🛂

  • @MohaMMaDiN55
    @MohaMMaDiN55 6 лет назад +6

    If two even numbers were added, the answer should be an even number i.e, 2+0=2. this is true.
    If an even number was added with an odd number, the answer should be an odd number. i.e, 3+0=3. this is also true.
    If an even number is multiplied by an even number, the answer is an even number. i.e, 2x0=0. this shows that the number zero is even.
    If an odd number is multiplied by an even number, the answer is an even number. i.e, 3x0=0. this also shows that the number zero is even.
    Even numbers and odd numbers are only called after integers (numbers with no decimal point)

  • @masturboy8437
    @masturboy8437 9 лет назад +28

    That bald guy knows little about the history of math: he says that zero was banned by the catholic church because it was introduced by the time of the crusades, ignoring the well known fact that Pope Sylvester II (also known as Gerbert of Aurillac) himself introduced the arabic numerals in Europe (forcing the clergy to use them) more than 160 years before Leonardo de Pisa was even born. Also, Gerard of Cremona and Robert of Chester translated al-Khwarizmi's works several decades before the birth of Fibonacci. The first crusade started in 1096, when the decimal system had been already in use (not by everybody of course) for amost a century. Fibonacci was important in popularising this decimal system but was not the first and not the only (apparently merchants who dealt with the arabs were at least as important as intellectuals in getting used to the new system and importing it into Europe). I don't know what happened later but those stories about zero being banned in Florence seem to be related to local government and not the higher authorities of the Church (in which case it would have been banned in Rome or Avignon instead), i've also read that it was banned because of the novelty of the system which lead to suspicions of fraud and speculation. I don't know about that but all i can say is that Fibonacci is important enough to need any help from people adding legendary merits to his legacy. Fibonacci's Liber Abaci by the way does mention zero which he calls zephir (probably contributing to giving it its modern name) but wasn't a translation of somebody else's work though he acknowledged the contribution of arab and persian mathematicians to his own learning. I want to point out also that Fibonacci called the arab numerals "indorum" in that book, this means indian numbers not arabs, and we can find them called indian in many other old books and manuscripts, so it wasn't like everybody simply ignored that they came from India rather than from northern Africa. Also Al-Khwarizmi was persian, not from North Africa (though he was famous all across the muslim world so it was easy to learn about him while being in Egypt or Morocco).

    • @smurfyday
      @smurfyday 9 лет назад +5

      +Masturboy84 You should look up independent accounts before jumping to the defense of the Catholic Church. Copernicus, Galileo, and hundreds of thousands of "witches" later, and you still can't accept it has never been a front-runner on anything useful in society. I hate to say Wikipedia, but you should look it up before saying religious folks didn't try to ban 0.

    • @masturboy8437
      @masturboy8437 9 лет назад +6

      All i am defending is an informed exposition of historical data which is something this video lacks. I know very well Galileo's life and also Copernicus' but i don't understand why you mention the latter since he was never prosecuted by the Church (the same institution that he belonged to). And even if he was that doesn't change any of what i've said about the history of the decimal system, which is what this discussion is about (we're not talking about astronomy). If you want to discuss my statements about the story of the use of the arab numerals please provide reliable sources that show me i'm wrong to say Fibonacci wasn't the first to introduce them into Europe or any of the other points i'm trying to make.

    • @eugenecallahan1698
      @eugenecallahan1698 6 лет назад +5

      Right: the history of Arabic numerals and the Church that Roger Bowley offers is complete BS: the Church never called them evil and they were introduced in Europe a couple of hundred years before Fibonacci. Wikipedia mentions nothing like what 'smurfyday' implies, and I asked a professional historian of mathematics about it and he said, "Yes, complete BS."

    • @eugenecallahan1698
      @eugenecallahan1698 6 лет назад +2

      Also, (I think it is Roger Bowley... not sure where I got his name, though) can't even be bothered to get auxilliary details right: the book he mentions was by al-Khwarizmi, not al-Khwazimi, and he was Persian, which is fairly far from "North Africa."

    • @eugenecallahan1698
      @eugenecallahan1698 6 лет назад

      @@smurfyday "hundreds of thousands of "witches"" It was thousands, and they were almost all burned by Protestants.

  • @Will_tell_you_later
    @Will_tell_you_later 3 года назад +4

    Plot twist : they were explaining that "is zero, even a number".

  • @Inspirator_AG112
    @Inspirator_AG112 3 года назад +1

    Yes! Zero is even.
    *PROOFS:*
    ·> It results in an integer when divided by 2.
    ·> Even exponents always result in positive numbers or zero, a zero exponent results in +1, a positive number.
    ·> Point-symmetrical shapes have an even number of lines of symmetry, think about the letter Z.
    ·> Even numbers do not change the parity(-Even/odd) when added. Adding zero does not change the number at all.
    ·> A product with an even number of negative signs will result in a positive product, while an odd number of negative signs will result in a negative product. Zero negative signs will result in a positive product.
    ·> Every even number is in between two odd numbers (-And vice-versa). Zero is in between two odd numbers.

  • @steveapplegate2425
    @steveapplegate2425 6 лет назад +3

    It would be interesting if you discussed how the Romans viewed zero and how they did calculations. I know they used the abacus, but what about paper calculations?

    • @barthanson3043
      @barthanson3043 10 месяцев назад

      What is the Roman numeral for zero, BTW?

  • @brendanmccabe8373
    @brendanmccabe8373 5 лет назад +4

    Wasn’t Alqazeme from the Middle East also I apologise for misspelling his name

    • @thehiddenninja3428
      @thehiddenninja3428 5 лет назад +1

      Yes, Al-khwarizmi was indeed from the middle east, in the Persian Empire.
      His name is also the origin of the word "algorithm"

  • @apex_xd8907
    @apex_xd8907 4 года назад +7

    random person: anything divided by 0 equals infinity
    mathmeticians: oooo you're naughty

    • @metawarp7446
      @metawarp7446 4 года назад +6

      More like:
      Mathematicians: *facepalm
      :D

    • @justabunga1
      @justabunga1 4 года назад +2

      You cannot say that anything divided by 0 is infinity because infinity is not a number. It should say that any number divided by 0 is undefined. Infinity is just a symbol to tell you that the limit is approaching something larger/smaller on that value. You will see that in calculus something called limit of a function. What is happening at x that goes to 0 from either side? Say like x=0.1,0.01,0.001,... and -0.1,-0.01,-0.001,...Do you see why it has different answers? That's why the limit has different answers, so it doesn't exist.

    • @justabunga1
      @justabunga1 4 года назад +1

      Muhammad Faran Aiki it is a number.

    • @Shedding
      @Shedding 4 года назад

      Physicist do interpret a division by 0 as infinity. Mathematicians like to say as the number gets divided by an ever smaller number (lim->0) the result approaches infinity.

  • @Anklejbiter
    @Anklejbiter 5 лет назад +2

    I like that they ended the video explaining the difference between 0 and NULL.

  • @TheLOLSquad
    @TheLOLSquad 6 лет назад +14

    The addition of odd and even numbers is quite interesting as well. When adding any even number to an odd number, the answer is always odd. But adding any odd number to an odd one gets an even.

  • @sergiomontecinos9631
    @sergiomontecinos9631 8 лет назад +5

    You should make a video about 1 being neither composite nor prime. (Don't know if I said it write)

  • @JackyRowe
    @JackyRowe 5 лет назад +18

    0:18 "£5, 20s"
    So £6 then...

  • @AdolphHItler-rs1wi
    @AdolphHItler-rs1wi 5 лет назад +2

    Whenever an even number is subtracted from an even number, the difference is always an even number.
    Eg. 4-2=2 or 8-2=6
    So, by that logic, isn't 2-2=0 also even?
    BTW, I typed this comment before watching the video.

    • @suspectdown5133
      @suspectdown5133 5 лет назад

      Yes, simple. Are you familiar with the Monty Hall Problem ?

  • @rhyannonsparks1457
    @rhyannonsparks1457 8 лет назад +4

    Numberphile, what are you doing to my life?

  • @diarminator
    @diarminator 5 лет назад +20

    3:55
    if you add 2 odd numbers together it's even

  • @Johnnymnemonic19
    @Johnnymnemonic19 10 лет назад +5

    Zero is my hero

  • @ianboard3555
    @ianboard3555 4 года назад +1

    To the point of not doing business with 0: years ago, I kept getting a bill from Sears for $0.00. The problem was solved when I sent them a check for $0.00.

  • @abdullahenaya
    @abdullahenaya 7 лет назад +7

    I've always considered 0 as even