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Séminaire Lotharingien de Combinatoire, B49e (2003), 8 pp.

# Gérald Ksavrelof and Jiang Zeng

#
Two Involutions for Signed Excedance Numbers

**Abstract.**
Two involutions on permutations and derangements are constructed.
They lead to a direct evaluation of some signed Eulerian
polynomials on permutations and derangements. The latter formulas,
combined with the exponential formula, give a new derivation of
the corresponding generating functions.

Received: May 2, 2003.
Revised: November 11, 2003.
Accepted: December 15, 2003.

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