Domination number of modular product graphs
arxiv(2024)
摘要
The modular product G♢ H of graphs G and H is a graph on vertex
set V(G)× V(H). Two vertices (g,h) and (g^',h^') of
G♢ H are adjacent if g=g^' and hh^'∈ E(H), or
gg^'∈ E(G) and h=h^', or gg^'∈ E(G) and
hh^'∈ E(H), or (for g≠ g^' and h≠ h^')
gg^'∉ E(G) and hh^'∉ E(H). A set D⊆ V(G)
is a dominating set of G if every vertex outside of D contains a neighbor
in D. A set D⊆ V(G) is a total dominating set of G if every
vertex of G contains a neighbor in D. The domination number γ(G)
(resp. total domination number γ_t(G)) of G is the minimum
cardinality of a dominating set (resp. total dominating set) of G. In this
work we give several upper and lower bounds for γ(G♢ H) in terms
of γ(G), γ(H), γ_t(G) and γ
_t(H), where G is the complement graph of G.
Further, we fully describe graphs where γ(G♢ H)=k for
k∈{1,2,3}. Several conditions on G and H under which γ
(G♢ H) is at most 4 and 5 are also given. A new type of
simultaneous domination γ̅(G), defined as the smallest number of
vertices that dominates G and totally dominates the complement of G,
emerged as useful and we believe it could be of independent interest. We
conclude the paper by proposing few directions for possible further research.
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