A natural bijection between permutations and a family of descending plane partitions

We construct a direct natural bijection between descending plane partitions without any special part and permutations. The directness is in the sense that the bijection avoids any reference to nonintersecting lattice paths. The advantage of the bijection is that it provides an interpretation for the seemingly long list of conditions needed to define descending plane partitions. Unfortunately, the bijection does not relate the number of parts of the descending plane partition with the number of inversions of the permutation as one might have expected from the conjecture ofMills, Robbins andRumsey, although there is a simple expression for the number of inversions of a permutation in terms of the corresponding descending plane partition. © 2010 Elsevier Ltd. All rights reserved.