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Recreational mathematics or puzzles with serious mathematical content. Note that math contest problems are generally considered off-topic.
8
votes
1
answer
726
views
Sticks and thread
I'm not particularly fond of maths puzzles, and I found this one in order to satisfy the party in a dinner of non-mathematic people, when I'm asked for a puzzle. …
24
votes
1
answer
2k
views
A puzzle about finding three points $(x,y)$, $(x,z)$ and $(y,z)$ in a subset of a square.
I was asked (by myself) to give a proof of the following seemingly simple geometric statement, but after thinking a little I now suspect it could be less elementary than I thought (or am I being silly …