19 citations · 134 across the 64 of their papers we have counts for
10 papers · 2 filters
On the Existence of Categorical Universal Coverings
Ali Pakdaman, Hamid Torabi, Behrooz Mashayekhy
In this paper, we study necessary and sufficient conditions for the existence of categorical universal coverings using open covers of a given space . As some applications, first…
On Hawaiian Groups of Some Topological Spaces
Ameneh Babaee, Behrooz Mashayekhy, Hanieh Mirebrahimi
The paper is devoted to study the structure of Hawaiian groups of some topological spaces. We present some behaviors of Hawaiian groups with respect to product spaces, weak join sp…
On Baer Invariants of Triples of Groups
Zohreh Vasagh, Hanieh Mirebrahimi, Behrooz Mashayekhy
In this paper, we develop the theory of Baer invariants for triples of groups. First, we focus on the general properties of the Baer invariant of triples. Second, we prove that the…
On Baer Invariants of Pairs of Groups
Zohreh Vasagh, Hanieh Mirebrahimi, Behrooz Mashayekhy
In this paper, we use the theory of simplicial groups to develop the Schur multiplier of a pair of groups to the Baer invariant of it, , with respect to…
Spanier spaces and covering theory of non-homotopically path Hausdorff spaces
Ali Pakdaman, Hamid Torabi, Behrooz Mashayekhy
H. Fischer et al. (Topology and its Application, 158 (2011) 397-408.) introduced the Spanier group of a based space which is denoted by $\psp$. By a Spanier space we mean a…
On topological fundamental groups of quotient spaces
Hamid Torabi, Ali Pakdaman, Behrooz Mashayekhy
Let be a quotient map, where is a subspace of . We explore conditions under which is dense in , where the f…