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Techniques for counting
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Elementary counting techniques
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Number of elements in cartesian products
Counting by partitioning
Counting techniques based on multiplication
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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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