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  1. prije 14 sati

    This math equation is dividing the internet, and no one can agree on an answer: |-1|-2|-3|=???

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  2. 28. sij
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    26. sij

    "If you’re in with the in crowd, you can find out which of the two [Annals] papers is currently believed by the elders." So, , which one of the papers is currently believed? I don't hold with such secrets being kept to the "in crowd".

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    20. sij

    henry wente: geometer & teacher. he left this world today: 20-jan-2020. he's the reason i'm a mathematician.

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    14. sij

    Amazing development: The Connes Embedding Conjecture, open since the 1970s, seems to have been refuted using quantum information tools, by Ji, Natarajan, Vidick, Wright, and Yuen.

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  6. 14. sij

    Simon Donaldson and Yakov Eliashberg are awarded the 2020 Wolf Prize in mathematics.

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    12. sij

    Kid: are there dwarves on Pluto? Me: ??? Kid: well, you said it was a dwarf planet.

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    12. sij

    Most of the work in this project was due to Matthias Goerner, at ’s semester program!

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    9. sij

    Icosahedron kaleidoscope with solid walnut exterior by Dave Honda. Cut and engraved using the laser. Inside view on 2nd pic. Available exclusively at the Joint Math meetings in Denver next week.

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    8. sij
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    8. sij

    And if you keep the piece on the other side of the cut, this is how it unfolds:

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  12. 8. sij

    I was amazed that there was a program that could effectively solve the knot equivalence problem, and it convinced me of the power of Thurston’s approach.

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  13. 8. sij

    In fact, when I was a grad student, I had a conjectural algorithm to untie unknots (later proved by Dynnikov). I described this idea to Thurston at MSRI during a graduate workshop, and then he took me up to the computer lab to show me SnapPea.

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  14. 8. sij

    Jeff Weeks (the principal architect of the program SnapPea) talks about his career in math. SnapPea had a huge influence on my early work on hyperbolic 3-manifolds. I still keep an old Mac on my desk just to run it! (a newer version SnapPy I find harder to use).

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    8. sij

    I just learned from that you could (in principle) construct any finite stage of the Koch snowflake by: • folding a square of paper • making a single cut • unfolding. Link to ’s paper version:

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  16. 8. sij

    Also inspired by

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    7. sij

    Mathematicians have come up with what is likely the fastest possible way to multiply two large numbers--my latest story for :

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  18. 7. sij

    Btw, I meant “infinitesimally thin” of course. I actually had to do this in a couple of cuts because the paper was too thick when folded. I’d be curious if anyone can get a deeper single cut of a Koch snowflake, maybe with thinner paper?

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  19. 7. sij

    I hadn’t realized the fires had gotten so much worse the past week - rethinking plans to go to Melbourne in 10 days. At least it has rained and there’s rain in the forecast.

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  20. 7. sij

    Tried to explain to my daughter how if you had infinitely thin paper and infinitely many folds, you could cut the Koch snowflake with a single cut. Inspired by the Jan. 6 entry of ’s page-a-day calendar.

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