Alex Kontorovich

@AlexKontorovich

professor at . Editor-in-Chief of Experimental Mathematics . Dean of Academic Content at . Advisory Board at

Vrijeme pridruživanja: studeni 2018.

Medijski sadržaj

  1. 31. sij

    My old friend, you have served me well. And now it is time to dust you off, and send you on to the next generation.

  2. 30. sij
    Odgovor korisnicima

    Simons Center at Stony Brook?

  3. 27. sij
    Odgovor korisnicima

    Thanks for sharing, these are great photos! (And I don't have any myself of the session, so thanks!) Steve, I don't think we even each other yet back then, is that right?

  4. 24. sij

    Just noticed. If diameter=1000, then circumference~=...

  5. 19. sij

    Good snow day for a Tinker Box to arrive in the mail. Double pendulum (chaotic) with LED shining on a glow board. Hours of fun!

  6. 17. sij
    Odgovor korisniku/ci

    Typo: your delta and F both have period 1, so the Fourier transform is: F^(n)=int_0^1 F(x) e^(-2pi i n x)dx, not int_{-infty}^infinity.

  7. 13. sij

    Beautiful animation of Soddy's sextet! One can even arrange for *all* the spheres in the resulting packing to have radii reciprocals of integers, as Soddy himself did, with actual balls, in 1937. (And one can prove a full local-global theorem here... )

  8. 10. sij
    Odgovor korisniku/ci

    Sure thing, that's why I posted the Mathematica code; feel free to play and adjust to your liking (same answer for 's request; I don't think it can be made interactive in twitter, but run the code in Mathematica and look at one still; rotate/zoom as you like) Enjoy!

  9. 10. sij

    2/2 Based on Matt Roscoe's $15,000 winning entry to 's Rosenthal Prize . Walk around and see what you find! One-story purple buildings are all primes. Tallest skyscrapers are at 256=2^8 and 384=2^7 x 3. Greens only on avenues 0,5,10,15. Etc. Enjoy!

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  10. 10. sij

    Welcome to Factor City! Here building blocks are primes, and the city shows the prime factorizations of 0 to 399, organized in 20x20 streets/avenues. Blue=2, Red=3, Green=5, Orange=7, Yellow=11, Purple=all other primes. (There is no building 0, and building 1 is black.) Cont'd

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  11. 8. sij
    Odgovor korisnicima

    Yes indeed! (Though there's a lag for editing.) All Math Encounters talks are freely available in full on youtube. Here is a randomly selected one ...

  12. 8. sij

    Odlyzko’s pair correlation data versus random matrix theory predictions

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  13. 8. sij

    The Montgomery/Dyson story (why you should always go to department tea)

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  14. 8. sij

    Selberg’s elementary proof of the prime number theorem (and Erdos...)

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  15. 8. sij

    Euler’s zeta(2)

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  16. 8. sij

    Primality testing

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  17. 8. sij

    Brian Conrey’s talk on the Riemann Hypothesis, tonight at

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  18. 7. sij

    Very convincing arguments here (I think) about Galileo's incompetence in mathematics (and the scientific method he is purported to have founded). The "Tracks of Galileo" exhibit is about the Brachistochrone Problem, the solution to which he famously blundered...

  19. 3. sij
    Odgovor korisnicima

    I'm reminded of this classic SNL sketch with Seinfeld as host. (Surely no math teacher ever feels this way, right?...)

  20. 2. sij
    Odgovor korisnicima i sljedećem broju korisnika:

    Actually I really enjoyed the first time there was a gravity snafu. We got into a discussion of the first computer “bug”, cosmic rays changing bits all the time, error correction (why it might might not work in quantum comp’s), etc.

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