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On Edge Semi-Isomorphisms and Semi-Dualities of Graphs

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Abstract

Let G1 and G2 be undirected graphs, and ℱ1(G 1) and ℱ2(G 2) be families of edge sets of G1 and G2, respectively. An (ℱ1,ℱ2)-semi-isomorphism ofG 1 ontoG 2 is an edge bijection between G1 and G2 that induces an injection from ℱ1(G 1) to ℱ2(G 2). This concept generalizes a well known concept of a circuit isomorphism of graphs due to H. Whitney. If has a “dual nature” with respect to ℱ2(G 2) then the concept of (ℱ1,ℱ2)-semi-isomorphism of graphs turns into a concept of a (ℱ1,ℱ2)-semi-duality of graphs. This gives a natural generalization of the circuit duality of graphs due to H. Whitney. In this paper we investigate (ℱ1,ℱ2)-semi-isomorphisms and (ℱ1,ℱ2)-semi-dualities of graphs for various families ℱ1(G 1) and ℱ2(G 2). In particular, we consider families of circuits and cocircuits of graphs from this point of view, and obtain some strengthenings of Whitney’s 2-isomorphism theorem and Whitney’s planarity criterion for 3-connected graphs.

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Kelmans, A.K. On Edge Semi-Isomorphisms and Semi-Dualities of Graphs. Graphs and Combinatorics 10, 337–352 (1994). https://doi.org/10.1007/BF02986684

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  • DOI: https://doi.org/10.1007/BF02986684

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