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B
Bijections and counting
C
Counting by partitioning
Counting techniques based on multiplication
E
Elementary counting techniques
L
Look at small cases
N
Number of elements in cartesian products
T
To compute probabilities of unions and intersections, use the inclusion-exclusion formula
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Littlewood-Paley heuristic for derivative
Littlewood-Paley heuristic
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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