Dan Li

collaborators

3 papers

math.CO2025

The index of $t C_{3}^{-}$ -free signed graphs

Dan Li, Mingsong Qin

The classical spectral TurÃ¡n problem is to determine the maximum spectral radius of an $F$ -free graph of order $n$ . This paper extends this framework to signed graphs. Let $\mathc…

math.CO2025

Spectral TurÃ¡n problem for $K_{3, 3}^{-}$ -free signed graphs

Mingsong Qin, Dan Li

The classical spectral TurÃ¡n problem is to determine the maximum spectral radius of an $F$ -free graph of order $n$ . Zhai and Wang [Linear Algebra Appl, 437 (2012) 1641-1…

math.CO2025

The index of unbalanced signed complete graphs whose negative-edge-induced subgraph is $K_{2, 2}$ -minor free

Mingsong Qin, Dan Li

Let $I^ = (K_{n}, H^{-})$ be a signed complete graph with the negative edges induced subgraph $H$ . According to the properties of the negative-edge-induced subgraph, characterizing the ex…

The index of tC3−​-free signed graphs

Spectral TurÃ¡n problem for K3,3−​-free signed graphs

The index of unbalanced signed complete graphs whose negative-edge-induced subgraph is K2,2​-minor free

The index of $t C_{3}^{-}$ -free signed graphs

Spectral TurÃ¡n problem for $K_{3, 3}^{-}$ -free signed graphs

The index of unbalanced signed complete graphs whose negative-edge-induced subgraph is $K_{2, 2}$ -minor free