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Questions designed to generate a "big list" of certain results, examples, conjectures, etc. via many individual answers, each contributing one or a few instances. Such a question should typically be in Community Wiki mode (CW); after asking, please, flag for moderators attention requesting the question to be made CW.

3 votes

Elementary + short + useful

Hilbert projection theorem
Sebastian Scholtes's user avatar
6 votes

How to present mathematics to non-mathematicians?

I would suggest having a look at the opaque square problem. The story of the problem is the following: Suppose you own a square piece ofland and you are being told that a phone line runs through it. …
Sebastian Scholtes's user avatar