Séminaire Lotharingien de Combinatoire, B31g (1993).
[Formerly: Publ. I.R.M.A. Strasbourg, 1994/021, p.
17-27.]
Marilena Barnabei, Giorgio Nicoletti and Luigi Pezzoli
The Symmetric Exchange Property for Poset Matroids
Abstract.
A poset matroid (i.e., a distributive supermatroid or combinatorial
scheme) is a non-empty family of ideals of some poset, closed
under taking
subideals and enjoying the matroid augmentation property. We
derive the analogue of the symmetric matroid basis exchange
property in
this more general context.
The paper has been finally published under the same title in
Adv. Math. 102
(1993), 230-239.