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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

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
Philippe Gaucher's user avatar
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 …
Philippe Gaucher's user avatar
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 …
Philippe Gaucher's user avatar