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Abstract
A spectral version of extremal graph theory problem is as follows: what is the maximum spectral radius of an H-free graph of order n? Nikiforov posed a conjecture on spectral extremal value of cycles. In the past decade, much attention has been paid to this conjecture and other questions on spectral extremal graphs. In order to approach to Nikiforov's conjecture, we provide a new conjecture on spectral extremal value involving fans and wheels. Moreover, we show it is true for k=2.
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