منابع مشابه
Excluding infinite minors
Robertson, N., P. Seymour and R. Thomas, Excluding infinite minors, Discrete Mathematics 95 (1991) 303-319. Let K be an infinite cardinal, and let H be either a complete graph with K vertices, or a tree in which every vertex has valency K. What can we say about graphs G which (i) have no minor isomorphic to H, or (ii) contain no sub graph which is a subdivision of H? These four questions are an...
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This sequel to Afzali Borujeni et. al. (2015) considers minors and duals of infinite gammoids. We prove that the class of gammoids defined by digraphs not containing a certain type of substructure, called an outgoing comb, is minor-closed. Also, we prove that finite-rank minors of gammoids are gammoids. Furthermore, the topological gammoids of Carmesin (2014) are proved to coincide, as matroids...
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ژورنال
عنوان ژورنال: Discrete Mathematics
سال: 1991
ISSN: 0012-365X
DOI: 10.1016/0012-365x(91)90343-z