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Dismantlability Revisited for Ordered Sets and Graphs and the Fixed-Clique Property

Published online by Cambridge University Press:  20 November 2018

John Ginsburg
John Ginsburg*
Affiliation:
Department of Mathematics, University of Winnipeg Winnipeg, Manitoba R3B 2E9
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Abstract

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We give a unified treatment of several fixed-point type theorems by using the concept of dismantlability, extended from ordered sets to arbitrary graphs. For a graph G and a vertex x of G we let NG(X) denote the set of neighbours of x in G. We say that x is a subdominant vertex of G if there is a vertex y of G, distinct from x, such that NG(x)∪{x} ⊆ NG(y)∪{y}. If G has n vertices we say that G is dismantlable if the vertices of G can be listed as x1, x2, ..., xi,..., xn such that, for all i = 1,2,..., n— 1, xi is a subdominant vertex of the graph Gi = G — {xj : j < i}

Keywords

05C9906A10graphordered setsubdominant vertexdismantlablegraph homomorphismfixedpointclique

Information

Type
Research Article
Information
Canadian Mathematical Bulletin , Volume 37 , Issue 4 , 01 December 1994 , pp. 473 - 481
Copyright
Copyright © Canadian Mathematical Society 1994

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