On a generalization of the Narayana triangle.
On a generalization of the Van Der Waerden conjecture
On a Generalized Linear Boundary Value Problem
On a geometric property of positive definite matrices cone.
On a group of mixed-type reverse-order laws for generalized inverses of a triple matrix product with applications.
On a -polar decomposition of a bounded operator and matrices of -symmetric and -skew-symmetric operators.
On a mean value theorem in the class of Herglotz functions and its applications.
On a new class of structured matrices related to the discrete skew-self-adjoint Dirac systems.
On a nonnegative irreducible matrix that is similar to a positive matrix
Let A be an n×n irreducible nonnegative (elementwise) matrix. Borobia and Moro raised the following question: Suppose that every diagonal of A contains a positive entry. Is A similar to a positive matrix? We give an affirmative answer in the case n = 4.
On a question of Hills concerning co-transposers
On a result of Williamson.
On a Schur complement inequality for the Hadamard product of certain totally nonnegative matrices.
On a singular set for the restriction of the characteristic map to a linear subspace of
On a strong form of a conjecture of Boyle and Handelman.
On a surprising relation between the Marchenko–Pastur law, rectangular and square free convolutions
In this paper, we prove a result linking the square and the rectangular R-transforms, the consequence of which is a surprising relation between the square and rectangular versions the free additive convolutions, involving the Marchenko–Pastur law. Consequences on random matrices, on infinite divisibility and on the arithmetics of the square versions of the free additive and multiplicative convolutions are given.
On a System of Functional Equations
On a theorem by Kronecker. (Short Communication).
On a theorem of Everitt, Thompson, and de Pillis
On a Theorem of Gersgorin.
On a variational problem for an infinite particle system in a random medium.