We determine the maximum index and the signed graphs with the maximum index among all K2,t⁻-free unbalanced signed graphs with fixed order for t≥ 3, as well as the second maximum index and the signed graphs with the second maximum index among all K2,t⁻-free unbalanced signed graphs with fixed order for t≥ 4.
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Hongying Lin (2024) studied this question.
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