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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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Geometric view of Hölder's inequality
Diagonal arguments
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Try to prove a stronger result
Use self-similarity to get a limit from an inferior or superior limit.
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Lower degree by increasing dimension (or vice-versa)
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