“School of Mathematics”
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| Paper IPM / M / 9556 | ||||||||||||||||||||||
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Let G be a graph of order n and let μ be an eigenvalue of
multiplicity m. A star complement for μ in G is an induced
subgraph of G of order n−m with no eigenvalue μ.
In this paper, we study
maximal and regular graphs which have Kr,s+t K1 as
a star complement for 1 as the second largest eigenvalue.
It turns out that some well
known strongly regular graphs are uniquely determined by such a star
complement.
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