Séminaire Lotharingien de Combinatoire, B46d (2001), 19 pp.

Mark Skandera

An Eulerian Partner for Inversions

Abstract. A number of researchers studying permutation statistics on the symmetric group Sn have considered pairs (x, Y), where x is an Eulerian statistic and Y is a Mahonian statistic. Of special interest are pairs such as (des, maj), whose joint distribution on Sn is given by Carlitz's q-Eulerian polynomials. We present a natural Eulerian statistic stc such that the pair (stc, inv) is equally distributed with (des, maj) on Sn, and provide a simple bijective proof of this fact. This result solves the problem of finding an Eulerian partner for the Mahonian statistic inv. We conjecture several properties of the joint distributions of stc with the statistics des and maj.

Received: April 30, 2001; Accepted: June 15, 2001.

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