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Questions related to permutations, bijections from a finite (or sometimes infinite) set to itself.

3 votes

Simplicial set of permutations

In this case, this poset is obtained by ordering permutations by subword inclusion up to deletion and monotone reordering. … In any case, the lattice of permutations ordered by pattern containment has been studied by Jason Smith. …
Russ Woodroofe's user avatar