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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.

-6 votes

What are the most overloaded words in mathematics?

Space Affine space Banach space Cauchy space Euclidean space Function space Hardy space Hilbert space Inner product space Kolmogorov space Krein space Klein space Pontrjagin space Lp spac …
3 votes

What are the most overloaded words in mathematics?

Reflexive (relation, locally convex (Banach) space, operator algebra, module, a.s.o.) It is an adjective. Proposition Every infinite dimensional von Neumann algebra is reflexive, and also it is not …
172 votes

Examples of common false beliefs in mathematics

"Any subspace of a separable topological space is separable, too." Sounds natural.
2 votes

Examples of inequality implied by equality.

Another "Hilbertian" example: Bessel's inequality follows from Bessel's equality. See, e.g., http://www.math.uri.edu/~quinn/web/mth629_Bessels.pdf. And now (maybe off-topic, but the question is rathe …
6 votes

Which math paper maximizes the ratio (importance)/(length)?

My favourite is the following tiny, self-contained article: "Uniform equivalence between Banach Spaces" by Israel Aharoni & Joram Lindenstrauss, Bulletin of the American Mathematical Society, Volume 8 …
2 votes

What are some famous rejections of correct mathematics?

This is somehow related to, yet it is not about a specific result, but it's about a life. Namely, according to these sources: https://en.wikipedia.org/wiki/Nikolai_Luzin#The_Luzin_affair_of_1936, and …
6 votes

Famous mathematical quotes

Mathematicians are born, not made. -- Henri Poincare