2 papers
math.CO2025
More on the full Brouwer Laplacian spectrum conjecture
Xiaodan Chen, Junwei Zi
Brouwer conjectured that the sum of the first largest Laplacian eigenvalues of an -vertex graph is less than or equal to the number of its edges plus for ea…
math.CO2019
A note of values of minors for Hadamard matrices
Yongbin Li, Junwei Zi, Yan Liu +1
In this note we present a formulae for all possible values of minors of an Hadamard matrix of order .