A beast from the 2020 Berkeley Integration Bee

Поделиться
HTML-код
  • Опубликовано: 29 сен 2024
  • You'll be pleasantly surprised by this one.
    If you like the channel, consider supporting me on Buy Me A Coffee using the following link:
    www.buymeacoff...

Комментарии • 47

  • @violintegral
    @violintegral Год назад +21

    A classic use of symmetry, good one! Integrals like these are great because they look absolutely impossible at first, but once you learn the trick they're a piece of cake. Integrals of this form were one of my first introductions to integration techniques beyond those taught in standard calculus classes for that reason.

  • @kobethebeefinmathworld953
    @kobethebeefinmathworld953 Год назад +6

    A great use of the King's Property of Integration. 👍

  • @miguelcontreras8372
    @miguelcontreras8372 Год назад +3

    que horror de caligrafía

  • @tanuhonggonegoro4601
    @tanuhonggonegoro4601 Год назад +1

    It's a very amazing and very cool improper integral .

  • @AT-zr9tv
    @AT-zr9tv Год назад +40

    It's almost magical that the integral doesn't depend at all on the denominator.

    • @maths_505
      @maths_505  Год назад +10

      And the proof is surprisingly satisfying

  • @circuitcraft2399
    @circuitcraft2399 Год назад +25

    Careful: treating an improper integral as symmetric is only valid if you already know it converges.
    In this case, the exponential in the numerator ensures that, but it's worth justifying.

  • @MrWael1970
    @MrWael1970 Год назад +18

    Wonderful integral

  • @Alcooliques_sans_frontieres
    @Alcooliques_sans_frontieres Год назад +2

    Thumbs down for the ads.
    For the bee: i didnt see it. I wanted to see a bee or better a whole swarm of bees.
    I find the title deceptive, promising bees where no bees are.

  • @cirnobyl9158
    @cirnobyl9158 Год назад +4

    Nice. When I saw the expression my first thought was "this is so complicated", and my second thought was, "surely this is too complicated to be solved any other way, it MUST be some kind of even-odd function symmetry trick, that's the only way this would be on a contest".

  • @homerthompson416
    @homerthompson416 Год назад +7

    Wow that is a freaking wild integral. Curious do you have a favorite math book? Especially in analysis? I think my favorite hard math book is Michael Artin's Algebra, and my favorite laid back book is The Gamma Function by his dad Emil Artin haha. My analysis classes were with Baby Rudin and then Royden though and didn't particularly like either book.

  • @quark67000
    @quark67000 Год назад +2

    0:45 Before writing I=... you need to prove that this improprer integral converges. Also at 6:34, you cannot write explicitely ∞ at the bound, it isn't a number. You need to uses the limit. I hope this can improve your next videos. Apart of these little remarks, great technic for obtain the final result.

    • @violintegral
      @violintegral Год назад +4

      This isn't a Real Analysis class, so those points are of little importance to this video. A proof of the convergence of this integral is trivial and careful limiting is implied in his notation, he's just using a shorthand.

    • @Ligatmarping
      @Ligatmarping Год назад +2

      I see your point but it wouldn't improve the video I think. The convergence in the first case is obvious at the level at which this video is directed to. The second one, the infinite limit of integration, comes from the former; since it converges, it coincides with it's principal value (limit of the integral from -a to a with a going to +infinity), that's the other integral from 0 to a and that converges to the integral from 0 to +infinity, withous issues since you are integrating something positive. All of this would only make for a longer video with no really ideas, just technicism which isn't required here.

  • @MrDerpinati
    @MrDerpinati Год назад +3

    wow thats really cool
    odd and even functions are really useful huh

  • @kewalmer7225
    @kewalmer7225 Год назад +1

    It was quite easy although it looked tricky at first glance, solved it in a minute

  • @Arandomguy1yl
    @Arandomguy1yl 4 месяца назад

    This is one of the easiest integrals you put in your channel, the recent ones are just 💀🔥
    Though glad I sometimes solve few

  • @holomurphy22
    @holomurphy22 Год назад +1

    I knew the trick. These integrals are kind of "artificial"

  • @giuseppemalaguti435
    @giuseppemalaguti435 Год назад +1

    1/ln2020...il mio metodo è simile al tuo...io non ho usato le generalizzazioni come hai fatto tu... però il risultato è identico

  • @borutjurciczlobec9302
    @borutjurciczlobec9302 Год назад +1

    Ne serite s tem

  • @birdbeakbeardneck3617
    @birdbeakbeardneck3617 Год назад +2

    Love that instead of just solving, u inttoduced the pattern

  • @mekbebtamrat817
    @mekbebtamrat817 Год назад +3

    Thank you for your work

  • @Falcon33H
    @Falcon33H Год назад +1

    What is the software you use for your vidéos ? Thanks

  • @robertsandy3794
    @robertsandy3794 Год назад +1

    Nice. Papa Flammy did something like this a few years ago too

    • @maths_505
      @maths_505  Год назад +2

      Yeah but his proof sucked so obviously I had to do something better 😂

  • @TheIndianPrince_
    @TheIndianPrince_ 7 месяцев назад

    as a jee aspirant i did this in a minute!!
    thanks bruv

  • @konoveldorada5990
    @konoveldorada5990 Год назад +3

    *Challenge Integral*
    (a^2-x^2)^((1/2) +c)) from bounds 0 to a where c is 0,1,2,3...
    Note(s): *Do not evaluate the integral by taking specific values of c.*
    *There must be a better and more specific solution for this integral.*
    *I do not understand Beta, Gamma functions, but I still managed to solve it to get at least a general solution.*
    HINT: *My answer contains Infinite Product.*

  • @cellosean
    @cellosean Год назад

    That's fricking amazing.

  • @BruceWayne-mk9km
    @BruceWayne-mk9km Год назад +2

    Excellent !!

  • @hectorjosedelarosagutierre8998
    @hectorjosedelarosagutierre8998 Год назад +1

  • @MathOrient
    @MathOrient Год назад +1

    Fantastic !

  • @manstuckinabox3679
    @manstuckinabox3679 Год назад +1

    Bruh That was freaking insane, I always end up learning something new from your vids lol

  • @Happy_Abe
    @Happy_Abe Год назад +1

    I see you corrected it after my comment, good job!

  • @sakshamk4009
    @sakshamk4009 Год назад +1

    This is JEE level easily 😂

    • @adityakumar2159
      @adityakumar2159 Год назад

      ???? It was on the easier side

    • @Maths_3.1415
      @Maths_3.1415 Год назад +2

      I don't know what you people get after showing off every time

  • @Ligatmarping
    @Ligatmarping Год назад +1

    Wow! nice technique!

  • @maalikserebryakov
    @maalikserebryakov Год назад

    0:05 Form zero

  • @uhbayhue
    @uhbayhue Год назад

    That was beautiful explained, thank you!

  • @zunaidparker
    @zunaidparker Год назад +3

    That was awesome! Thanks for taking the time to prove the general result, really gives insight into the problem!

    • @maths_505
      @maths_505  Год назад +2

      Yeah the only fun thing about today's video was the proof and its actually 🔥🔥🔥

  • @GOVERNORofBRITISHschoolCOLONY
    @GOVERNORofBRITISHschoolCOLONY Год назад +1

    Write numbers and words properly

  • @daniilbograchev8111
    @daniilbograchev8111 Год назад

    It was really cool, but I dislike a such type of trick, it is too special for real physical problems