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7
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Properties of permutations with unknown pattern avoidance descriptions

Background Many properties of permutations can be stated in terms of classical patterns. For example: a permutation is stack-sortable if and only if it avoids 231 (Knuth 1975) a permutation ...
3
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231 views

Stricter permutation patterns

(I asked this ten days ago on math.SE, but I received no reply, so I'm trying again here.) A lot of work has been done on patterns in permutations, where a permutation is said to match a given ...