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European Journal of Combinatorics
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Cellular Bipartite Graphs

Cellular bipartite graphs
Authors: Victor Chepoi; Hans-Jürgen Bandelt;

Cellular Bipartite Graphs

Abstract

Graphs that are obtained from single edges and even cycles by successive amalgamations are called cellular graphs. Especially cellular bipartite graphs are investigated in this paper. Since graphs with their shortest-path metrics are particular instances of finite metric spaces, these investigations are done from a metric point of view. A particular class of finite so-called \(\ell_1\)-spaces is formed by the totally decomposable spaces, in which the summands in an \(\ell_1\)-decomposition obey a certain compatibility rule. In this paper, it is shown that the bipartite graphs with totally decomposable metric have a convenient decomposition scheme, the ingredients of which are gated amalgamation as a fundamental operation and even cycles and single edges as building stones. Here the connection to cellular graphs is given. The main results are three theorems: (a) It is shown that for a bipartite graph \(G\) with at least two vertices six conditions are equivalent, for instance: (1) the metric of \(G\) is totally decomposable, and (4) \(G\) is a cellular graph (Theorem 1). (b) Every cellular bipartite graph with at least two vertices has either two pendant vertices or a pendant gated cycle, where a gated cycle of length \(k\) is said to be pendant in \(G\) if it includes a path of length \({k \over 2}-2\), all vertices of which have degree 2 in \(G\) (Theorem 2). (c) Every cellular bipartite graph either is indecomposable or possesses a gated cutset that is a tree (a cutset \(R\) of a connected graph is any subgraph for which \(G-R\) is disconnected) (Theorem 3). For cellular bipartite graphs \(G\) the authors also obtain a kind of Euler formula, namely for such a graph \(G\) with \(n\) vertices, \(m\) edges, and \(g\) gated cycles holds \(n - m + g = 1\) (Corollary 1). Further, by application of the proofs of Theorems 1 and 2 and especially with the help of an elimination scheme of Theorem 2, it can be shown that cellular bipartite graphs can be recognized by a quadratic time algorithm (which is also described in the present note). Finally the authors show in two propositions that the cellular structure of a cellular bipartite graph \(G\) is also reflected by a median property for triplets of vertices.

Related Organizations
Keywords

even cycles, decomposition, Computational Theory and Mathematics, cellular graphs, bipartite graph, Structural characterization of families of graphs, Geometry and Topology, Paths and cycles, Theoretical Computer Science

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
19
Average
Top 10%
Average
hybrid