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A
A good way of proving that a set is countable
A quick way of recognising countable sets
B
Building examples with given properties
F
Finding subsets front page
H
How to use the continuum hypothesis
J
Just-do-it proofs
T
Transfinite induction
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Littlewood-Paley heuristic for derivative
Littlewood-Paley heuristic
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Try to prove a stronger result
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Prove a consequence first
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