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user:1234 user:me (yours) |
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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.
11
votes
Useless math that became useful
Perhaps homology and the simplicial methods of algebraic topology (and algebraic geometry) which are just now finding applications in topological data analysis. I think algebraic geometry and topology …
9
votes
Suggestions for good notation
All of the notations created to simplify writing category theory. For instance, the idea of drawing a circular arrow inside of a diagram to indicate that that diagram is commutative. As well as the i …