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Enumerative combinatorics, graph theory, order theory, posets, matroids, designs and other discrete structures. It also includes algebraic, analytic and probabilistic combinatorics.

6 votes

Convert integer to permutation number

This correspondence is known as "combinadics", for which there is a nice Wikipedia article. Factoradics is a similar correspondence for permutations. I'd used similar self-generated methods a few tim …
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