Yi Wang

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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…