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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.

7 votes

Nonequivalent definitions in Mathematics

The category of models of a (finitary or infinitary) first-order theory A model category which is an abstract setting for doing homotopy theory The first notion is expounded for example in the Adam …
4 votes

Which mathematical definitions should be formalised in Lean?

Sorry for asking a question here but it is too long for a comment. Or maybe if you tell me it's wrong, I'll delete it and I could post it as a regular question in MathOverflow instead. What is th …
3 votes

Free open-access peer-reviewed math journals

Cahier de topologie et géométrie différentielle catégoriques Theory and Applications of Categories Categories and General Algebraic Structures with Applications New York Journal of Mathematics