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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

When is 2 qualitatively different from 3?

Mutual information of two random variables is non-negative and I daresay well understood. Mutual information of three or more random variables can be negative, and is monstrously unintuitive.
0 votes

What are examples of mathematical concepts named after the wrong people? (Stigler's law)

Marden’s theorem was proved by Siebeck. What rankles is that Marden himself cited Siebeck but it is now called Marden’s theorem. Dan Kalman was the one who brought this to people's attention and his d …