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Proving "for all" statements
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Transfinite induction
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Just-do-it proofs
To prove facts about Borel sets, use closure properties
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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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