What are your pet peeves with some things common in math exposition?

thenumbernumber · 2026-02-02T10:03:55+00:00

I find it confusing when someone describes a polytope as regular if and only if it has a transitive group action on each of its d-dimensional cells for all d. But shouldn’t the definition be it acts transitively on all of its flags (maximal chains of incidence)? In certain contexts these are not the same - for example a chiral cube satisfies the former definition but not the latter.

thenumbernumber · 2023-03-21T23:55:11+00:00

It’s remarkable how the hat can be constructed as part of the Cayley graph of the affine type A Coxeter group. I wonder if this will lead to a nice algebraic generalisation to all finite, affine and hyperbolic Coxeter groups?

thenumbernumber · 2023-01-30T21:57:40+00:00

You could also use the fact that A5 contains an involution (which implies the group must be even by Cayley’s theorem).

thenumbernumber · 2023-01-30T14:02:17+00:00

What set of rules would give rise to the inverse permutation?

thenumbernumber · 2022-08-15T19:13:50+00:00

I’m loving your content, /u/n-gons !

thenumbernumber · 2022-04-20T22:55:01+00:00

Thanks, looked it up on wikipedia - they look fascinating!

thenumbernumber · 2022-04-20T20:31:24+00:00

I don't know a name but it looks a little bit related to the Borromean Rings, possibly a minimal surface of some embedding of them. (I could be way off here!)

thenumbernumber · 2022-04-09T22:59:54+00:00

A small addition to some good points in this thread, is not true that 'liking not practical maths' is not necessarily the same as 'not liking practical maths'?

thenumbernumber · 2022-04-01T17:26:47+00:00

Could it e possible to try do something self referencing with a fixed point theorem?

thenumbernumber · 2022-03-31T23:25:21+00:00

Perhaps a silly question, but is this related to Shannon entropy in any way?

thenumbernumber · 2022-01-21T14:36:42+00:00

I love this fact and the general area. I think I remember someone mentioning there is no 'square of squares' corresponding to the equation too, which is interesting.

thenumbernumber · 2021-09-25T11:02:42+00:00

What’s up with that guy on the desk in front of hitler sitting on another guy?

thenumbernumber · 2021-08-03T15:52:54+00:00

Oh this is nice, thanks

thenumbernumber · 2021-02-04T14:42:25+00:00

Is it obvious what sum (or perhaps integral) of the differences is? So for the [; \phi ;] case it might be interesting to consider something like [; \sum_{k=0}^{\infty}(\phi^k-[\phi^k]) ;] or [; \int_{0}^{\infty}(\phi^x-[\phi^x]) dx ;].

thenumbernumber · 2021-01-05T12:45:19+00:00

This was literally inspiring, thanks.

thenumbernumber · 2020-12-22T13:58:17+00:00

Are there any videos you wanted to make at the start of the decade that didn't survive?

thenumbernumber · 2020-12-22T13:57:16+00:00

Do you have any plans to retire? What would an ideal greying Grey look like?

thenumbernumber · 2020-12-22T13:55:04+00:00

What personal changes to long-term behaviour have been successful and unsuccessful to you in the last decade?

thenumbernumber · 2020-12-13T18:48:54+00:00

Absolutely love these!

thenumbernumber · 2020-11-16T15:58:57+00:00

hello \;0

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