Peter Rowlett @peterrowlett@mathstodon.xyz
- Homepage
- http://peterrowlett.net/
- Location
- Nottingham, UK
Teach maths & research maths education.
Joined Apr 2017
Currently a lot of my time is preparing for and running vivas for final year undergrad projects. Last week some game theory (Nim), yesterday's was about GCSE maths curriculum content, today it's fractals on the complex plane.
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?
Peter Rowlett
boosted
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
Peter Rowlett
boosted
So, in amongst updating Mastodon, I've made the site a little bit more mathsy: the logo now has a matrix \[ \begin{pmatrix}x&&\\&y&\\&&z\end{pmatrix}\] in it, and the site uses the Computer Modern fonts for that extra-mathematical look
Oh crumbs, first day back in the office yesterday and I forgot Mastodon existed. Mostly did email, student queries and marking; you didn't miss much.
Peter Rowlett
boosted
@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
Peter Rowlett
boosted
Observe that we can use \(\LaTeX\) on this instance - if needed.
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.
- Homepage
- http://peterrowlett.net/
- Location
- Nottingham, UK
Teach maths & research maths education.
Joined Apr 2017
