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How to use group actions
Actions on topological spaces
Proving results by letting a group act on a finite set
Representation theory front page
To show that a group element is non-trivial, show that it has a non-trivial action or image
Use topology to study your group
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Littlewood-Paley heuristic for derivative
Littlewood-Paley heuristic
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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