So, mathstodon. Something a little lighter since it's Sunday and all that. What's your favourite maths fact?
Bonus points if it's incredibly trivial! 😊
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@mrlyonsmaths that's impossible to answer - there are way to many great math results. But
Among nontrivial things: the fact that geometry can be used to study group theory discovered by Gromov. various dualities, Atiyah-Singer Index Theorem, the fact that homeomrphic but not diffeomorphic manifolds exist.
Among trivial but useful things: Eckmann–Hilton argument.
