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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