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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

Failures that lead eventually to new mathematics

Another thing that comes into mind (with connection to the FLT), is the unique factorization in the ring of integers of a number field. That was the basic mistake in Cauchy's and Lamé's proof of the F …
2 votes

Applications of Representation Theory in Combinatorics

One of the most well known applications of representation theory in combinatorics is the explicit construction of Expander graphs by Margulis (using Kazhdan's property (T)). See any book about expande …
5 votes
Accepted

Gelfand representation and functional calculus applications beyond Functional Analysis

There are some examples in ergodic theory. Furstenberg's correspondence principle basically relays on Gelfand's representations. Another example - the functional calculus gives a very easy proof of …
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1 vote

Easy and Hard problems in Mathematics

Changing the question from "integral quadratic form represents zero" to "real quadratic form almost represents zero", changes the classical theorems (which eventually sum up to the Hasse-Minkowski the …
1 vote

Fiction books about mathematicians?

The Oxford Murders is a nice novel about a graduate student in Oxford, which specializes in logics (it seems that the author has a PhD in logics). The book is kind of nice, and it was adapted to a fil …