a repository of mathematical know-how
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To calculate a contour integral, use theorems rather than direct calculation
To prove facts about finite groups, use induction on the order
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Geometric view of Hölder's inequality
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
Lower degree by increasing dimension (or vice-versa)
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Countable but impredicative
I don't think this statement
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choice of the field
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Higher dimensional analogues
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