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How to work without an identity element when you clearly need it
Decompose your ring using idempotents
If you don't have an identity element, a set of local units is more than enough
Ring theory front page
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Littlewood-Paley heuristic for derivative
Geometric view of Hölder's inequality
Diagonal arguments
Finding an interval for rational numbers with a high denominator
Try to prove a stronger result
Use self-similarity to get a limit from an inferior or superior limit.
Prove a consequence first
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