Christian Lawson-Perfect @christianp@mathstodon.xyz

Hallo, new Mastodon users! Here on mathstodon.xyz we've got a couple of mathematical emoji: and . I'd love to add some more. If you can make a PNG image the same size as those, send it to me and I'll add it. Faces of famous mathematicians are an easy place to start; could we have some shapes, polyhedra, or other mathographics too?

Today is my birthday! Please tell me fun maths facts

This is simultaneously objectively rubbish and subjectively lovely.
My very first #plotterdon

There's making a rounding error, and then there's rounding off to two decimal places after each step of the calculation. And a PhD student did this!

All these apps offering to organise your monthly outgoings or show stats on your TV viewing habits have given me the idea to write an app to help you remember your mother's maiden name

Thanks for your photos, everyone!
I made the same request on twitter and got even more photos. If you'd like to see them, the thread is at https://twitter.com/christianp/status/1344003979076923392

My 3-year-old would like to know what winter looks like around the world. Could you reply with a photo of what it looks like near you at the moment?

Here's what it looks like near us, in North-East England.

I think it worked! The release notes are at https://github.com/tootsuite/mastodon/releases/tag/v3.3.0

Going to try to update mathstodon.xyz to mastodon 3.3.0. Wish me luck!

Weird: the #python datetime library can make a datetime for 1st January 1AD, but can't produce its unix timestamp:

> datetime(1,1,1,0).timestamp()
ValueError: year 0 is out of range

> datetime(1,1,2,0).timestamp()
-62135510325.0

Wanted: a function that takes a description of a family relation and returns the number of different paths in the family tree it could describe (considering siblings with the same parents as equivalent)