Spectral Turán problem for $t{\mathcal{K}}_4^{-}$-free unbalanced signed graphs

Linfeng Xie, Xiaogang Liu

Let $t{K}_4$ denote the family of all graphs consisting of $t$ copies of $K_4$ that are allowed to share vertices and $t{\mathcal{K}}_4^{-}$ be the set of all unbalanced signed graph…