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General problem-solving tips
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If you don't know how to make a decision, then don't make it
General problem-solving tips
How to solve cubic and quartic equations
If an argument looks promising but needs a hypothesis, assume the hypothesis for now but try to remove it later
Keep parameters unspecified until it is clear how to optimize them
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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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