## On q-derangement numbers

**
Michelle L. Wachs**
**Abstract:**
We derive a q-analogue of the classical formula for the number of derangements of an n-element set.
Our derivation is entirely analogous to the classical derivation,
but relies on a descent set preserving bijection between the set of permutations
with a given derangement part and the set of shuffles of two permutations.

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