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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.

1 vote

Non-arithmetic proof of the integrality of a rational expression

Here is a kind of fun observation which probably doesn't help. The quantity $$\frac{k-1}{k}\frac{2k-1}{2k}\cdots \frac{nk-1}{nk}$$ has an interpretation as the probability that an element of $S_{nk}$ …
Philip Engel's user avatar
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