2 papers
math.RA2026
Entrywise Positivity Preservers on Green Matrices
Wei Xie
We classify the entrywise functions that preserve positive semidefiniteness on discrete Green matrices \(G(p,q)=(p_{\min(i,j)}q_{\max(i,j)})\) with positive parameters, without req…
math.FA2026
Entrywise Loewner Preservers on Min and Max Matrix Cones
Wei Xie
Let \[ A_{\min}(x)=\bigl(x_{\min(i,j)}\bigr)_{i,j=1}^n, \qquad A_{\max}(x)=\bigl(x_{\max(i,j)}\bigr)_{i,j=1}^n \] be the Min and Max matrices generated by a real sequence \(x=(x_1,…