Ya-Yang Liu

collaborators

4 papers

math.CO2026

Positive Square Energy of Graphs with Minimum Degree at Least Two

S. Akbari, Fu-Tao Hu, Ya-Yang Liu

Let $s^{+} (G)$ denote the sum of the squares of the positive adjacency eigenvalues of a graph $G$ . The square-energy conjecture of Elphick, Farber, Goldberg, and Wocjan, proved by Li…

math.CO2026

Positive and Negative Square Energies of $2$ -Connected Graphs

S. Akbari, Fu-Tao Hu, Ya-Yang Liu

Let $G$ be a graph of order $n$ , and let $s^{+} (G)$ and $s^{-} (G)$ denote the sums of the squares of the positive and negative adjacency eigenvalues of $G$ , respectively. Recently, Liu…

math.CO2026

Extremal graphs for a conjecture on the square energy of graphs

Fu-Tao Hu, Ya-Yang Liu, Yi Wang

For a graph $G$ , let $s^{+} (G)$ and $s^{-} (G)$ denote the sums of the squares of its positive and negative adjacency eigenvalues. We determine all equality cases in the conjecture of E…

math.CO2026

Changes in the Seidel energy of blow-up graphs under edge deletion

Yayang Liu, Yi Wang

Let $S (G)$ denote the Seidel matrix of a simple graph $G$ , and let $E_{S} (G)$ be the Seidel energy of $G$ , defined as the sum of the absolute values of the eigenvalues of $S (G)$ . In…

Positive Square Energy of Graphs with Minimum Degree at Least Two

Positive and Negative Square Energies of 2-Connected Graphs

Extremal graphs for a conjecture on the square energy of graphs

Changes in the Seidel energy of blow-up graphs under edge deletion

Positive and Negative Square Energies of $2$ -Connected Graphs