Dense-core approach to the Brualdi--Hoffman--Turán problem on odd wheels

Longfei Fang, Mingqing Zhai, Yuhan Zhang

We present a unified presentation of the fixed-size adjacency-spectral extremal problem for odd wheels $W_{2k+1}$, where $k\ge 2$ and $W_{2k+1}=K_1\vee C_{2k}$. The exceptional cas…