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Techniques for comparing sets and mathematical structures
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A quick way of recognising countable sets
A good way of proving that a set is countable
Cardinality, measure and category
Techniques for comparing sets and mathematical structures
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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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