“School of Mathematics”
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| Paper IPM / M / 9539 |
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| Abstract: | |||||
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We consider θ-graphs, that is, graphs obtained by subdividing
the edges of the multigraph consisting of 3 parallel edges. It is
shown that any θ-graph G is determined by the spectrum
(the multiset of eigenvalues)
except possibly when it contains a unique 4-cycle.
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