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