Title

On sign-representable matroids

Document Type

Article

Publication Date

1-1-1993

Abstract

A matroid M will be called sign-representable if, for every basis B of M, there is a (0,1, — 1)-matrix [Ir Ι Y] representing M over Q in which the first r columns correspond to the members of B. The class of sign-representable matroids, which is closely related to the important class of regular matroids, is easily seen to be closed under both duality and the taking of minors. This paper proves several characterizations of the class, including a constructive one, and shows that the excluded minors for the class are U2,5, U 3,5, the Fano matroid and its dual, and the rank-3 whirl. © 1993, Cambridge Philosophical Society. All rights reserved.

Publication Source (Journal or Book title)

Mathematical Proceedings of the Cambridge Philosophical Society

First Page

499

Last Page

506

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