@evelynjlamb welcome! I like the idea of here but regularly forget to check it. Your blog post reminded me I'm on here.

@peterrowlett "Quantities" is far too narrow. "Logical structures" maybe.

Definition of mathematics given by the Guardian uni league table. What do we think? https://www.theguardian.com/education/ng-interactive/2017/may/16/university-guide-2018-league-table-for-mathematics

https://mathstodon.xyz/media/S_WD_3jASDnkl0QQoCg

My friend @c_j_smith@twitter.com calls this #markathon2017

Quote is from the latest BBC More or Less episode on Radio 4 (though a similar claim was made on the World Service edition of the programme). But isn't self-similarity about similarity at different scales, i.e. parts resembling the whole? Am I wrong?

Lessons from my #proofinatoot writing:

1. The mastodon interface has no markdown preview; can admins add one? For example, here's one: https://kerzol.github.io/markdown-mathjax/editor.html

2. Greek letters are *expensive*; latex \(\alpha\) is 6 characters, plus 4 for math mode. Unicode α is only 1.

3. All those extra spaces in my easy-to-read latex source add up!

Okay, that wasn't pretty, but I felt #proofinatoot was being quite number theory-y ;)

\( (u(x)v(x))'=\lim_{\delta x\to 0}\frac{u(x+\delta x)v(x+\delta x)-u(x)v(x)}{\delta x}. \)

Add and subtract \( u(x+\delta x)v(x) \) in the numerator. Then

\( (u(x)v(x))'=\lim_{\delta x\to 0}\frac{u(x+\delta x)v(x+\delta x)-u(x+\delta x)v(x)+u(x+\delta x)v(x)-u(x)v(x)}{\delta x} \)

\( =\lim_{\delta x\to 0}u(x+\delta x)\lim_{\delta x\to 0}\frac{v(x+\delta x)-v(x)}{\delta x}+\lim_{\delta x\to 0}\frac{u(x+\delta x)-u(x)}{\delta x}\lim_{\delta x\to 0}v(x) \)

\( =u(x)v'(x)+u'(x)v(x). \) #proofinatoot

@peterrowlett Roz Chast is great; alas the only link I know to the cartoon is to a store:

I enjoyed "I learned some math on the streets" https://mathstodon.xyz/@bremner/289

I was on octodon for a few days. Also was on hackertribe.io for two minutes to test something. Can't delete either of those, but @christianp set this up so now I'm trying Mastodon here.

Teach maths & research maths education at Sheffield Hallam University. Blog, occasionally, at http://aperiodical.com/

My website: http://peterrowlett.net/

Joined Apr 2017