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The maximum index of signed complete graphs whose negative edges induce a bicyclic graph
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The maximum index of signed complete graphs whose negative edges induce a bicyclic graph
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Let $\Gamma=(K_n,H)$ be a signed complete graph whose negative edges induce a subgraph $H$. Let $A(\Gamma)$ be the adjacency matrix of the signed graph $\Gamma$. The largest eigenvalue of $A(\Gamma)$ is called the index of $\Gamma$. In this paper, the index of all the signed complete graphs whose negative edges induce a bicyclic graph $B$ is investigated. Specifically, the structure of the bicyclic graph $B$ such that $\Gamma=(K_n,B)$ has the maximum index is determined.
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