Interesting Quanta article explaining the "universal covering problem", aka finding the smallest convex region that can cover an entire set of shapes; even restricting to shapes of "diameter 1" still leaves a tough unsolved problem in #mathematics

https://www.quantamagazine.org/how-simple-math-can-cover-even-the-most-complex-holes-20200108/

Over on that other microblogging platform, John Baez points out how easy it is for mathematical physics crackpottery to get published in a prestigious-sounding pay-to-publish journal from an actually-prestigious publisher, Nature Scientific Reports: https://twitter.com/johncarlosbaez/status/1208768265830354945

In the ensuing discussion, Flavio Nogueira reports that editors rejected papers only to see them published anyway: https://twitter.com/F_S_Nogueira/status/1208787145911152640

Should we start treating Nature as a predatory publisher?

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@Breakfastisready The trailer https://www.youtube.com/watch?v=82c2HDp-ntg makes it look intriguing. And the fact that the Kindle version won't be released for a few more days is making me think it would be worth the wait to go for paper instead.

Abstract aerial photography by JP and Mike Andrews: https://www.thisiscolossal.com/2019/07/manmade-patterns-and-uncanny-shadows-photographed-from-above-by-jp-and-mike-andrews/

G2 shall be my favorite group! Well, for now. For a while. Or maybe for longer. It's the smallest of the exceptional Lie groups. Found 1893 by Élie Cartan. It was he who suggested to think about it in terms of rolling balls.

https://en.wikipedia.org/wiki/G2_%28mathematics%29

Picture two spheres, one three times larger than the other. Imagine them rolling on another without slipping nor twisting. Rolling surfaces have their own branch of mathematics: contact geometry!

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I research mathematics.

I'm here to try and pursue an acceptable way to procrastinate away from mathematics.

Joined Aug 2018