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existence of non-principal ultrafilters
Existence of non-principal ultrafilters
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How to use Zorn's lemma
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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
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Use self-similarity to get a limit from an inferior or superior limit.
Prove a consequence first
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