4 papers
math.CO2026
Signed graphs with fixed smallest eigenvalue at least and their lattices
Meng-Yue Cao, Jack H. Koolen, Jing-Yuan Liu +1
In this paper, we consider connected signed graphs with smallest eigenvalue at least for a small positive constant . We prove that if such a signed gr…
math.CO2026
A structure theory for signed graphs with fixed smallest eigenvalue
Meng-Yue Cao, Jack H. Koolen, Jing-Yuan Liu +1
In this paper, we give a structure theory for signed graphs with fixed smallest eigenvalue. As a consequence, we prove that for every , if a connected signed…
cs.IT2024
The hulls of matrix-product codes and related entanglement-assisted quantum error-correcting codes
Meng Cao
Let denote the group of all semilinear isometries on , where is a prime power. Matrix-product (MP) codes are a cl…
cs.IT2024
Special matrices over finite fields and their applications to quantum error-correcting codes
Meng Cao
The matrix-product (MP) code with a non-singular by column (NSC) matrix plays an important…