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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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Geometric view of Hölder's inequality
Diagonal arguments
Finding an interval for rational numbers with a high denominator
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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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