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Chandler-Ullmann Hall

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17 Memorial Dr. E, Bethlehem, PA 18015

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Department of Mathematics Spring 2026 Colloquium Series - Prof. Yu Deng

Department of Mathematics Spring 2026 Colloquium Series - Prof. Yu Deng

Wed, May 6, 2026 3:30pm

Chandler-Ullmann Hall, 218

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Department of Mathematics Spring 2026 Colloquium Series - Dr. Elia Brué

Department of Mathematics Spring 2026 Colloquium Series - Dr. Elia Brué

Wed, Apr 29, 2026 3:30pm

Chandler-Ullmann Hall, 218

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Dept of Mathematics Spring 2026 Colloquium Series - Dr. Sanat Sarkar

Dept of Mathematics Spring 2026 Colloquium Series - Dr. Sanat Sarkar

Wed, Apr 22, 2026 3:30pm

Chandler-Ullmann Hall, 218

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Noncrossing partitions, braid groups, and complex polynomials Michael Dougherty, Lafayette Abstract: The n-strand braid group is one of the most important objects in geometric group theory, in part because it lies in the overlap of many different classes of groups, including Artin groups and mapping class groups. Topologically, this group can be viewed as the fundamental group for the space of monic complex polynomials with distinct roots, and algebraically it is often defined using a generating set of n-1 diagrams depicting half-twists of adjacent strands. Work of Birman-Ko-Lee, T. Brady, and Bessis around the turn of the century introduced a new generating set for these groups which used the lattice of noncrossing partitions, and the combinatorics of this lattice has led to breakthroughs in our understanding of braid groups and Artin groups more generally. In this talk, I will describe some new connections between noncrossing partitions, braid groups, and complex polynomials. This is joint work with Jon McCammond. Tea and refreshments available from 3:00-3:25 p.m. in the Assmus Conference Room (CU 212).

Dept of Mathematics Spring 2026 Colloquium Series - Professor Sir John Ball

Wed, Apr 1, 2026 3:30pm

Chandler-Ullmann Hall, 218

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Dept of Mathematics Spring 2026 Colloquium Series - Michael Dougherty

Dept of Mathematics Spring 2026 Colloquium Series - Michael Dougherty

Wed, Mar 25, 2026 3:30pm

Chandler-Ullmann Hall, 218

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Dept of Mathematics Spring 2026 Colloquium Series - Shmuel Weinberger

Wed, Mar 18, 2026 3:30pm

Chandler-Ullmann Hall, 218

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