ProfGhristMath

@robertghrist

illustrating & animating mathematics; penn professor; paterfamilias

philadelphia, pa
Joined August 2008

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  1. Pinned Tweet
    Jan 12

    this semester, i am teaching multivariable calculus for engineers , using materials from the Calculus BLUE Project, a video-text on youtube. you can check out the (updated for 2020) trailer here...

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  2. working on a new project...

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  4. Retweeted
    Feb 2

    “Giving grace. Listening to a political opponent’s concerns. Finding common humanity. In 2020, these seem like radical propositions. But when it comes to changing minds, they work.”

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  5. Retweeted
    Feb 1

    I was trying to bring some order to my bookshelves when I came across my copy of “Littlewood’s miscellany” and started browsing. I promise I am never going to complain about my teaching load again.

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  6. Jan 31
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  7. Retweeted
    Jan 30

    [1/2] Now that the ingenious has posted linkages that compute both squares and cubes, I thought it would be fun to reverse-engineer the squaring one. If you want to work through this in detail yourself, note that all lengths are multiples of 1/16. The magic here…

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  8. Retweeted
    Jan 28

    Lecture 3 of computational algebraic topology is up! Here we meet Euler characteristics, chain complexes and homology. If you make it to the end, there's ONE WEIRD PICTURE THAT EXPLAINS EVERYTHING. OTHER IMAGES HATE IT.

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  9. Retweeted
    Jan 28

    I've been on Twitter too long. This just makes me think of Professor and

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  10. Retweeted
    Jan 25
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  11. Retweeted
    Jan 25
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  12. Retweeted
    Jan 21

    The first lecture of computational algebraic topology is almost ready. Needs more cowbell.

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  13. Jan 20

    farewell dr. wente. god bless you. thank you for who you were & all you did.

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  14. Jan 20

    & now he's gone. i've been so lucky to have the chance to pay it forward by teaching lots of engineering students calculus. (& not minding being thought of as weird) i've been so lucky to have a job where i can find new things too, sometimes.

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  15. Jan 20

    i never thought about being a mathematician -- even the idea of going to graduate school was not part of my culture growing up. but henry wente more than anyone taught me that there's this vast unknown world of crazy objects that we can just barely imagine with enough effort.

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  16. Jan 20

    henry wente was the first person who taught me that mathematicians do research -- that there's more to discover -- that even when the rest of the world says a thing shouldn't exist, it may yet be found.

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  17. Jan 20

    it took time, but i stopped thinking of him as a comic calc prof, and started getting to know him. he was an amazing teacher & i learned so much from him. so, i took more classes from him. i took 12 classes from him. anything i could get.

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  18. Jan 20

    henry wente worked on this tirelessly while he was a tenure-track professor at tufts (iirc). he was turned down for tenure. thankfully, the university of toledo gave him a position. he stayed at toledo for the rest of his career.

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  19. Jan 20

    eventually, i learned about the "wente tori" -- the counterexamples to conjecture of h. hopf on constant-mean-curvature surfaces that had remained open for so long. the original "wente torus" -- a CMC torus -- came as a surprise.

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  20. Jan 20

    we asked him about it -- to distract from class, of course. he muttered something about curvature blah^3. he was so earnest and shy about it. like he was talking about love. he was talking about a torus.

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  21. Jan 20

    we engineering students were agog: the picture was labelled a "wente torus". we couldn't figure out why somebody would name something after our weird calc prof.

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