@jessfraz welcome to mathstodon! In addition to MathJax, we have automatic TeX-to-unicode if you type macros outside delimiters, e.g. π ≈ ²²/₇

A big list of unlikely or surprising Turing-complete systems: gwern.net/Turing-complete, via metafilter.com/183095/On-havin

My favorite: SVG is Turing-complete because it can be used to (slowly) simulate Rule 110 (and one hopes the weird boundary conditions needed to make Rule 110 Turing complete): github.com/tom-p-reichel/svg-i

@bmreiniger it's three because on a Fano plane each point lies on three lines. In the projective plane, there'd be as many colours as pictures on a single card (is it 7?)

Doing some artistic thinking because I've got to fill a lot of picture frames in the department in a hurry.
Ignoring the colours, which ones do you like the most?
No image descriptions because these are all pretty abstract!
(1/2)

@bmreiniger
You'll like this puzzle that I made recently: thingiverse.com/thing:3856293
That axiomatization is an encapsulation of why the game Dobble (Spot-It in the USA) works.

Cryptographic and Physical Zero-Knowledge Proof Systems for Solutions of Sudoku Puzzles
None by Gradwohl, Ronen and Naor, M. and Pinkas, Benny and Rothblum, G.
In collections: Easily explained, Protocols and strategies, About proof
URL: springerlink.com/index/N156688
Entry: read.somethingorotherwhatever.

xslt 

@halcy I'm more surprised that cigarette vending machines are still legal!

Let \(a(1) = 1\).
Define \(a(n) = a(n-1) + n^k\), where \(k\) is the lowest positive integer such that \(a(n-1)+n^k\) has more decimal digits than \(a(n-1)\).

Is it always true that \(a(n)\) has \(n\) digits?

Hello dragons, thanks for inviting me today. I'm here to pitch my new range of sportswear for mathematicians, "Left As An Exercise".
I'm looking for £100k for a non-measurable subset of the business, which I believe we can double within a year.

There are two types of mathematician in the world: those who like to include the current year in their exercises/examples/puzzles and those who don't.

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