TITLE

# Characterization of Line Sidigraphs

AUTHOR(S)
Sampathkumar, E.; Subramanya, M. S.; Reddy, P. Siva Kota
PUB. DATE
March 2011
SOURCE
Southeast Asian Bulletin of Mathematics;2011, Vol. 35 Issue 2, p297
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A sigraph (sidigraph) is an ordered pair S = (G; Ïƒ) (S = (D; Ïƒ)), where G = (V, E) (D = (V, A) is a graph (digraph) called the underlying graph (underlying digraph) of S and Ïƒ : E â†’ {+, -} (&sigma: A â†’ {+, -}) is a function. The line sigraph (line sidigraph) of a sigraph (sidigraph) S = (G; Ïƒ) (S = (D; Ïƒ)) as a sigraph (sidigraph) L(S) = (L(G); Ïƒ') (L(S) = (L(D); Ïƒ')), where L(G) (L(D)) is the underlying graph (digraph) of L(S) is the line graph (digraph) of G, where for any edge (arc) Due to image rights restrictions, multiple line equation(s) cannot be graphically displayed. in L(S), Due to image rights restrictions, multiple line equation(s) cannot be graphically displayed.. Analogous to the known result that the line sigraph of any sigraph is balanced, it is shown that line sidigraph of any sidigraph is balanced. In this paper, we define a given sigraph (sidigraph) S to be a line sigraph (line sidigraph) if there exists a sigraph (sidigraph) H such that L(H) is isomorphic to S. We then give a structural characterization of line sidigraphs. Further, in this paper, we introduce the notion switching in sidigraphs and we characterize the sidigraphs which are switching equivalent to their line sidigraphs.
ACCESSION #
64873454

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