please tell me the most obscure joke you know

(feel free to explain or not explain it, depending on what you find more amusing to think of me reading it)

@whitequark Q: What's an anagram of Banach-Tarsky?

A: Banach-Tarsky Banach-Tarsky.

@whitequark The Banach-Tarsky Paradox goes roughly that if you'd divide a sphere in three dimensional space into (infinite!) pieces and then reassemble them, you've got enough for two.

So, if you disassemble "Banach-Tarsky" and rearrange it again (basically what an anagram does), you get twice the words.

Banach-Tarski Paradox -- from Wolfram MathWorld

First stated in 1924, the Banach-Tarski paradox states that it is possible to decompose a ball into six pieces which can be reassembled by rigid motions to form two balls of the same size as the original. The number of pieces was subsequently reduced to five by Robinson (1947), although the pieces are extremely complicated. (Five pieces are minimal, although four pieces are sufficient as long as the single point at the center is neglected.) A generalization of this theorem is that any two...

@whitequark Oh and of course:

Q: What's the shortest math joke?
A: Let ε < 0.

Being that ε, by convention, is always a very small number greater 0, and it being smaller (or equal, in some variations) is just a startling effect.

@ljrk @whitequark This one made it to my list of quotations that get build into my email signature file.
@ljrk This type of anagram should be known as bananagram :)
@ljrk @whitequark The. B in Benoit B. Mandelbrot stands for Benoit B. Mandelbrot
@ljrk
@whitequark Here to drop in the oldie goodie https://youtu.be/uFvokQUHh08
Matematikrevyen 2011: Banach-Tarski

YouTube

@ljrk @whitequark

This is legit one of my favourite jokes, for its unbeatable ratio of knowledge required to humour contained.

@passenger @whitequark Same! I do get a lot of enjoyment out of jokes that require far too much of an explanation to be fun :'D

@passenger @whitequark Mind The Gap!

... between required knowledge and humour.