Soumya Dey

collaborators

3 papers

math.FA2026

von Neumann Inequality for a class of Doubly Contractive Weighted Shifts

Soumyadip Dey, Rajeev Gupta, Surjit Kumar

In this article, we investigate the ball version of von Neumann inequality for the class of doubly contractive $d$ -tuple of weighted shift. We show that if the weighted shift is ba…

math.GT2018

Commutator Subgroups of Singular Braid Groups

Soumya Dey, Krishnendu Gongopadhyay

The singular braids with $n$ strands, $n \geq 3$ , were introduced independently by Baez and Birman. It is known that the monoid formed by the singular braids is embedded in a group…

math.GT2018

Commutator Subgroups of Twin Groups and Grothendieck's Cartographical Groups

Soumya Dey, Krishnendu Gongopadhyay

Let $T W_{n}$ be the twin group on $n$ arcs, $n \geq 2$ . The group $T W_{m + 2}$ is isomorphic to Grothendieck's $m$ -dimensional cartographical group $C_{m}$ , $m \geq 1$ . In this…