Minimal bricks

A brick is a 3-connected graph such that the graph obtained from it by deleting any two distinct vertices has a perfect matching. A brick is minimal if for every edge e the deletion of e results in a graph that is not a brick. We prove a generation theorem for minimal bricks and two corollaries: (1) for it >= 5, every minimal brick on 2n vertices has at most 5n-7 edges. and (2) every minimal brick has at least three vertices of degree three. (C) 2006 Robin Thomas. Published by Elsevier Inc. All rights reserved.