A general strategy for solving Pell's equations (ft.

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  • Опубликовано: 3 янв 2025

Комментарии • 67

  • @blackpenredpen
    @blackpenredpen  5 дней назад +7

    What are the tens and the units digits of 7^7^7?
    Solution ruclips.net/video/_OAFyKZWwy8/видео.htmlsi=npITrvCxthrMc_QN

  • @amansparekh
    @amansparekh 5 дней назад +9

    What this links to is units in the ring Z[rootk]. Every unit has norm 1 and thus is a solution to the equation. Clearly units form a multiplicative group.

  • @randomjin9392
    @randomjin9392 5 дней назад +17

    But now the most important part: how do you find that "first solution" - and more importantly, enure that it is the first (i.e. smallest)? Guess and check sounds very involved for equations with non-trivial coefficients, e.g. x²-73y² = 1217

    • @acelm8437
      @acelm8437 4 дня назад

      Exactly, how do you even know a solution exists for all nonsquare k?

    • @SyberMath
      @SyberMath 4 дня назад +1

      You can use continued fractions to find the smallest solution and then build the others from that

    • @VideoFusco
      @VideoFusco 4 дня назад

      ​@@SyberMathi don't it is so obvious how to use continued fractioj for that

  • @paultijink4235
    @paultijink4235 5 дней назад +5

    Great! Please do make that video showing there are no other solutions!

  • @ssgamer5693
    @ssgamer5693 5 дней назад +5

    That notebook was the least asian thing in the video.I can confirm that every competitive exam aspirant prefers longbooks(400pgs+) for exam prep because it is easier to maintain and search old things.

  • @Blaqjaqshellaq
    @Blaqjaqshellaq 4 дня назад +1

    Squaring 9+4*5^(1/2) gives the pair {161, 72}. (I was waiting for you to give that pair, but I had to figure it out myself.)
    You can also use this method to give rational approximations of the square root of 5: 9/4, then 160/72=20/9...

  • @devrimturker
    @devrimturker 4 дня назад +1

    Log Ladders, Lemmermeyer's Product

  • @ComrdFinisher-zb4kq
    @ComrdFinisher-zb4kq 5 дней назад +27

    Nice to meet you ❤ Tomorrow morning I have mathematics exam wish me success

  • @Happy_Abe
    @Happy_Abe 5 дней назад +4

    Wouldn’t negating x values also give solutions so we also have all the reflected values

    • @aggelosaggelos8243
      @aggelosaggelos8243 5 дней назад

      so what? this is quite obvious since x^2=(-x)^2 for all reals. we are looking for the solution where x and y have the smallest absolute values they could have and we take the positive one for simplicity's sake. we say that the first solution (x1,y1) is the one for which |x1|

    • @Happy_Abe
      @Happy_Abe 5 дней назад

      @ yeah I’m just saying these are solutions too that weren’t mentioned since it was asked if these are all the solutions in the video, wasn’t a major point.

  • @thesupergamergr3255
    @thesupergamergr3255 3 дня назад

    Happy new year y'all!! 🎇🎇🎇🎆🎆🎆

  • @GreenMeansGOF
    @GreenMeansGOF 5 дней назад

    I want to see the proof! Also, can this be extended to when the right hand side is composite?

  • @hamdamoverali
    @hamdamoverali 5 дней назад

    Very well explained 😊

  • @asifulalamc
    @asifulalamc 4 дня назад

    Amazing video! Happy new year to everyone. 🎉🎆

  • @johns.8246
    @johns.8246 4 дня назад +1

    OK, now how about doing this for x^2 - 61y^2 = 1 ?

  • @scottleung9587
    @scottleung9587 5 дней назад

    Nice proof!

  • @jakobthomsen1595
    @jakobthomsen1595 5 дней назад

    Very interesting!

  • @johns.8246
    @johns.8246 4 дня назад

    And for that matter, is there a simple way of finding all integer solutions for elliptic curves of the form y^2 = x^3 - x + r^2 ?

  • @pzelact4328
    @pzelact4328 5 дней назад +3

    1:32 later is when? give me timecode so i can watch and understand every step not just seing something and forgeting about it

  • @Budgeman83030
    @Budgeman83030 3 дня назад

    I may not understand the math completely but the video is amazing to watch

  • @khoozu7802
    @khoozu7802 4 дня назад

    The pell equation x^2-2y^2=+-1 gives approximation of square root 2

  • @SDCORL
    @SDCORL День назад

    Secant ,tangent/k are all of the solutions.

  • @Choco_Black69
    @Choco_Black69 5 дней назад +3

    張耕宇學長好!

  • @kornelviktor6985
    @kornelviktor6985 5 дней назад

    The thumbnail is so cool

  • @Nikkikkikkiz
    @Nikkikkikkiz 4 дня назад

    In my classes, we solve this by having the solution be a continued fraction and just write answer in continued fraction format

  • @OubleJum
    @OubleJum День назад

    I dont understand anything, I just watch these to fall asleep

  • @elecbertelecbert-l5e
    @elecbertelecbert-l5e 19 часов назад

    The Chinese are very smart thank you

  • @trelligan42
    @trelligan42 4 дня назад

    Sorry, I really need comments for this gentleman.

  • @JollyBooger
    @JollyBooger 5 дней назад +1

    🎉🎉🎉

  • @kimsmoke17
    @kimsmoke17 4 дня назад

    Can you find a room with more echo? 😂

  • @JikoAmonus
    @JikoAmonus 5 дней назад +1

    im in 9th grade, I cant even do basic calculus

    • @محمدبورايب
      @محمدبورايب 5 дней назад

      it's not important for you, don't do it

    • @prabhakarsingh6821
      @prabhakarsingh6821 5 дней назад +1

      "Do not worry about your difficulties in Mathematics; I can assure you mine are still greater"
      - Einsteine

    • @محمدبورايب
      @محمدبورايب 5 дней назад

      @@prabhakarsingh6821 thank you i will use this quote later every there and where

  • @sergio6357
    @sergio6357 5 дней назад

    존나잘생겼네

  • @fuzzylostallrightstoexist
    @fuzzylostallrightstoexist 5 дней назад

    Zamn

  • @epicstar86
    @epicstar86 5 дней назад

    peak

  • @abdulrahmanabukharma7969
    @abdulrahmanabukharma7969 2 дня назад +1

    ruclips.net/video/uqwC41RDPyg/видео.html

  • @Maths786
    @Maths786 5 дней назад +1

    If "f" is a differentiable function on the interval [0, 1], with the following boundary conditions:
    f(0) = 0
    f(1) = 1
    Then, find the minimum value of the integral:
    ∫ from 0 to 1 of (f'(x))² dx.

  • @yukfaicheung7484
    @yukfaicheung7484 4 дня назад

    I will find god

  • @nouarislimani
    @nouarislimani 5 дней назад

    X=i^4 is solution of sqrt(x)=-1

    • @KewlWIS
      @KewlWIS 5 дней назад

      its not

    • @nouarislimani
      @nouarislimani 5 дней назад

      Sqrt(i^4)=i^2=-1

    • @KewlWIS
      @KewlWIS 5 дней назад +2

      @nouarislimani sqrt(i^4) = sqrt(1) = 1, youre thing is wrong cuz whenever you do sqrt(x^2) its always equal to |x|

    • @markerguy
      @markerguy 5 дней назад

      In mathematics we have a definition- √(x)² = |x|. Here it's √i⁴ = √(i²)² = √(-1)² = |-1| = 1. So this isn't possible.

    • @markerguy
      @markerguy 5 дней назад

      Also with that logic in mind you can say that (-1)² is a solution too.

  • @gobindaprasadpoudel
    @gobindaprasadpoudel 5 дней назад +1

    He has good knowledge of mathematics
    I had never learned till 10

  • @cy3er_hawkzz287
    @cy3er_hawkzz287 5 дней назад

    im too fast

  • @adamcionoob3912
    @adamcionoob3912 5 дней назад

    wow, that's so cool

  • @SudhakarSudhakardontineni
    @SudhakarSudhakardontineni 3 дня назад +1

    Happy New Year🎉❤ 🎂🎊💐👑💵💵💵💵💵💵🧠🧠🧠🧠🧠🧠📐(^o^) to MM is MATHEMATICS MASTER