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DMS Topology & Geometry Seminar - IISER Kolkata

Autumn 2026

Welcome to the Topology and Geometry Seminar at IISER Kolkata! Our seminars focus on the latest developments and cutting-edge research in topology and geometry, as well as related areas of mathematics. Seminars are open to all and may be held offline or online. While there is no fixed schedule, please check back frequently for updates. Join mailing group (or if you want to give a talk) for the latest seminar schedule and format updates. Stay connected with our community and don't miss out on exciting events. Thank you for your interest in the Topology and Geometry Seminar at IISER Kolkata! An archive of previous talks can be found in the following links: Spring 2023, Autumn 2023, Spring 2024, Autumn 2024, Spring 2025, Autumn 2025, Spring 2026.

Upcoming Talks

  • Published on

    Inclusion-exclusion in topology and algebraic geometry

    Ronno Das

    The inclusion-exclusion principle is a fundamental technique in combinatorics that allows passing between sizes of intersections and sizes of unions. We will explore a generalization of this formula where both the constituent pieces and the indexing set have extra structure, in particular a topology, inspired by the work of Vassiliev. We will then apply this technique to certain examples from algebraic geometry, namely the space of smooth polynomials and rational maps.

    Dates: 15th, 16th, 17th September 2026

    Time: 2-3 pm

    Venue: LHC 111

    • Previous Talks

    • Published on

      Monodromy and vanishing cycles for curves in a simply connected surface.

      Ishan Banerjee (The Ohio State University, USA)

      I will describe some joint work with Nick Salter in understanding the monodromy group associated to a complete linear system of curves in some smooth projective surface X. We prove that if X is simply connected and the linear system is sufficiently ample, then the monodromy group is of finite index in the mapping class group. I will try to be fairly concrete throughout the talk, in particular I will define the terms 'monodromy' and 'mapping class group'. I will also mostly focus on the concrete case of plane curves throughout the talk.

      Date: Friday (14th August 2026)

      Time: 11:45 am

      Venue: LHC 110