Or have I got it wrong and 2m is the distance in America too? I'm sure I heard 6ft a lot when I was there last month...

Met a woman who seemed to think of herself as a non-math person (though she didn't say it out loud), whose son had asked her how many points were in a circle. I didn't want to give a boring closed answer, so, thinking of eg the ℓ₁ norm, I started to say "it depends..." and she finished the sentence saying "..on how many dimensions you have?" :D

Needless to say, I congratulated her on an excellent observation!

https://www.ams.org/journals/notices/202001/rnoti-o1.pdf

I don't see why insisting our colleagues have inclusive values is just as bad as insisting our colleagues have exclusive values. In fact I don't see why insisting on some values is bad per se, it clearly depends on the values in question.

The argument that diversity statements harm the very people they are intended to help is much more convincing to me.

Could be a good puzzle either to prove, or if I am wrong to find a counter example.

Oh and probably n should be at least 3. So far I've mainly played games where n=3

I've been playing "binary sudoku". You have a 2nx2n grid, with some 0s and 1s and you have to fill it in according to some rules:

* each row and column has equal number of 0s and 1s

* no row or column has a run of three 0s or 1s

* no pair of rows is the same

* no pair of columns is the same

conjecture: there must be a pair of rows (or columns) that are "inverse" i.e. a pair of strings s t where s[i]=/=t[i] for all i.

I can see a boring case analysis proof but is there an "at a glance" proof?

I'm sure many of you have seen this, it's a couple of years old - there's a sort of lattice of quadrilaterals (a square is a rectangle is a parallelogram etc) but it's a bit ugly if you stick to standard named ones. Here a "kitoid" is introduced to make a really beautiful diagram

https://www.hambrecht.ch/blog/2017/7/26/the-quest-for-the-lost-quadrilateral

But it got me thinking, is there any well defined sense in which these categories are exhaustive (for convex quads)? And if so how many are there for n-gons

Mathematician, computer scientist, bassist, knitter?

Joined Jan 2018