Two months ago, I bought isthisprime.com and not only set up the internet’s fanciest primality-checking service, but also invented a rather addictive game. It quite quickly went viral, or as relatively viral as a maths game can get, with people tweeting their high scores and posting the link to reddit and Hacker News. I realised fairly…
Puzzlebomb is a monthly puzzle compendium. Issue 53 of Puzzlebomb, for May 2016, can be found here: Puzzlebomb – Issue 53 – May 2016 The solutions to Issue 53 can be found here: Puzzlebomb – Issue 53 – Solutions – May 2016 Previous issues of Puzzlebomb, and their solutions, can be found at Puzzlebomb.co.uk.
From Mark C. Wilson of the University of Auckland, a little public service announcement for anyone who’s ever been involved with a mathematical journal. Dear colleagues, There is much dissatisfaction with the current state of research publication, but little information on community attitudes and priorities. I have started a survey which I hope you will…
Here’s something fun you might want to spend some money on: a poster of the Mandelbrot set, in the style of an old-fashioned navigation chart. https://www.kickstarter.com/projects/billtavis/mandelmap-poster-a-vintage-style-map-of-the-mandel The Kickstarter has already racked up many multiples of the original funding goal with three weeks still to go, so it’s at the “effectively a pre-order” stage. The posters start at \$26. Kickstarter: Mandelmap…
Conjecture Every planar graph without 4-cycles and 5-cycles is 3-colourable. Nope! In a paper just uploaded to the arXiv, Vincent Cohen-Addad, Michael Hebdige, Daniel Kral, Zhentao Li and Esteban Salgado show the construction of a graph with no cycles of length 4 or 5 which isn’t 3-colourable: it isn’t possible to assign colours to its vertices so that no…
Warning: you could make a very strong argument I’ve thought far too much about something inconsequential. If that makes your stomach turn, look away now. This morning in the shower, I had an idle thought about my towel. It was, as always, folded neatly on the toilet seat. A problem that’s been bugging me for a few…
The next issue of the Carnival of Mathematics, rounding up blog posts from the month of March, and compiled by Matthew, is now online at Chalkdust Magazine. The Carnival rounds up maths blog posts from all over the internet, including some from our own Aperiodical. See our Carnival of Mathematics page for more information.