Christian Lawson-Perfect @christianp@mathstodon.xyz
Mathematician, koala fan, mathstodon.xyz admin,
⅓ of https://aperiodical.com
- Homepage
- http://somethingorotherwhatever.com
- Location
- Newcastle upon Tyne, UK
- Pronouns
- he/him
- Favourite number
- 3435
Mathstodon.xyz news:
1) I've just suspended a few dozen spam accounts created in the last 24 hours. How annoying! Registration is now closed, until I come up with a better way of stopping them. Any mathstodon user can invite people to join using the form in the preferences page: https://mathstodon.xyz/invites
2) I've updated the server to Mastodon v2.4.0. Release notes at https://github.com/tootsuite/mastodon/releases/tag/v2.4.0
Some fun features, including four free-text fields you can show on your profile.
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?
If someone with a disability or a chronic illness or a mental illness tells you something is too difficult for them to do, believe them. Maybe it's something they could do on another occasion. Maybe it's something you find, or even "everyone" finds, easy. Maybe it's something you found trivial to research or learn how to do. Believe them anyway. Maybe it's only three steps, maybe it's a piece of software, or a phone call. Believe them anyway.
Believe people when they tell you their experiences.
On Fibonacci Quaternions
Article by Serpil Halici
In this paper, we investigate the Fibonacci and Lucas quaternions. We give the generating functions and Binet formulas for these quaternions. Moreover, we derive some sums formulas for them.
URL: https://link.springer.com/article/10.1007/s00006-011-0317-1
Entry: http://read.somethingorotherwhatever.com/entry/OnFibonacciQuaternions
Thanks to UKClimbing.com I had a database of over 427k rock climbing routes to feed to a neural network. It did pretty well. http://aiweirdness.com/post/175339699997/blue-boulders-problem-1-more-rock-climbing-routes
Will augmented reality let me see the fractal, paper-thin region of space where an automatic faucet senses my hands?
This paper shows, among other things, that no hexagonal number is double another hexagonal number: https://arxiv.org/abs/1806.07981v1
New entry!
When are Multiples of Polygonal Numbers again Polygonal Numbers?
Article by Jasbir S. Chahal and Nathan Priddis
In collection: Easily explained
Euler showed that there are infinitely many triangular numbers that are three times another triangular number. In general, as we prove, it is an easy...
URL: http://arxiv.org/abs/1806.07981v1
PDF: http://arxiv.org/pdf/1806.07981v1
Entry: http://read.somethingorotherwhatever.com/entry/WhenareMultiplesofPolygonalNumbersagainPolygonalNumbers
I'm running a four-round instant knock-out tournament throughout the month of July to basically squeeze a load of fun maths out of my friends. Let's see if we can make it all come together! Voting starts on the 1st of July.
http://aperiodical.com/2018/06/announcing-the-big-internet-math-off/
Sometines I have a really hard time telling 0 and 1 apart.
I think everything is now upgraded
About to upgrade the server that runs mathstodon.xyz. Server will be up and down for a bit
phew, this conference judges papers on both originality and innovativeness
Intriguing! A brick that's like the 3D analogue of A-series paper: you can cut it in half to produce two bricks similar to the original
https://math.stackexchange.com/questions/2822566/a-cuboid-that-can-be-bisected-into-two-cuboids-all-three-being-similar-sides-r
Chill maths observation:
I like 98 and 99 because their prime factorisations feel kind of like they've taken different, slightly symmetric routes to almost the same place
2*7*7=3*3*11 -1
Oh my god this is such a rich seam: http://lav.io/2014/05/transform-any-text-into-a-patent-application/ - Using some really impressive looking Python libraries for text processing to mine public domain literature for phrases that fit into Patent titles and claims. Includes awesomely ridiculous patent claims derived from the Communist Manifesto.
Efficient Algorithms for Zeckendorf Arithmetic
Article by Ahlbach, Connor and Usatine, Jeremy and Pippenger, Nicholas
In collection: Easily explained
We study the problem of addition and subtraction using the Zeckendorf representation of integers. We show that both operations can be performed in linear time; in fact they can be performed by combinational...
URL: http://arxiv.org/abs/1207.4497
PDF: http://arxiv.org/pdf/1207.4497v1
Entry: http://read.somethingorotherwhatever.com/entry/Ahlbach2012
Most helpful statement of the year, from @ColinTheMathmo: "That's a list of 10 (in some base)"
