27 citations · 104 across the 16 of their papers we have counts for
16 papers
Module structure of the homology of right-angled Artin kernels
E. Artal Bartolo, J. I. Cogolludo-Agustín, S. López de Medrano +1
In this paper, we study the module structure of the homology of Artin kernels, i.e., kernels of non-resonant characters from right-angled Artin groups onto the integer numbers, the…
Characteristic varieties of graph manifolds and quasi-projectivity of fundamental groups of algebraic links
E. Artal Bartolo, J. I. Cogolludo-Agustín, D. Matei
The present paper studies the structure of characteristic varieties of fundamental groups of graph manifolds. As a consequence, a simple proof of Papadima's question is provided on…
On multiserver retrial queues: history, Okubo-type hypergeometric systems and matrix continued-fractions
F. Avram, D. Matei, Y. Q. Zhao
We study two families of QBD processes with linear rates: (A) the multiserver retrial queue and its easier relative; and (B) the multiserver M/M/infinity Markov modulated queue. Th…
On the second nilpotent quotient of higher homotopy groups, for hypersolvable arrangements
Daniela Anca Macinic, Daniel Matei, Stefan Papadima
We examine the first non-vanishing higher homotopy group, , of the complement of a hypersolvable, non--supersolvable, complex hyperplane arrangement, as a module over the grou…
Arrangements of hypersurfaces and Bestvina-Brady groups
Enrique Artal Bartolo, Jose Ignacio Cogolludo-Agustin, Daniel Matei
We show that quasi-projective Bestvina-Brady groups are fundamental groups of complements to hyperplane arrangements. Furthermore we relate other normal subgroups of right-angled A…
Orbifold groups, quasi-projectivity and covers
Enrique Artal Bartolo, Jose Ignacio Cogolludo-Agustin, Daniel Matei
We discuss properties of complex algebraic orbifold groups, their characteristic varieties, and their abelian covers. In particular, we deal with the question of (quasi)-projectivi…