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Cycle Frames of Complete Multipartite Multigraphs ‐ III
Authors:A Muthusamy  A Shanmuga Vadivu
Affiliation:Department of Mathematics, Periyar University, Salem, Tamil Nadu, India
Abstract:For two graphs G and H their wreath product urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0001 has vertex set urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0002 in which two vertices urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0003 and urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0004 are adjacent whenever urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0005 or urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0006 and urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0007. Clearly, urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0008, where urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0009 is an independent set on n vertices, is isomorphic to the complete m‐partite graph in which each partite set has exactly n vertices. A 2‐regular subgraph of the complete multipartite graph urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0010 containing vertices of all but one partite set is called partial 2‐factor. For an integer λ, urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0011 denotes a graph G with uniform edge multiplicity λ. Let J be a set of integers. If urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0012 can be partitioned into edge‐disjoint partial 2‐factors consisting cycles of lengths from J, then we say that urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0013 has a urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0014‐cycle frame. In this paper, we show that for urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0015 and urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0016, there exists a urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0017‐cycle frame of urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0018 if and only if urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0019 and urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0020. In fact our results completely solve the existence of a urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0021‐cycle frame of urn:x-wiley:10638539:media:jcd21373:jcd21373-math-0022.
Keywords:decomposition  factorization  cycle frame
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