In-person class cancellation and work-from-home / Annulation des cours en présentiel et télétravail

Updated: Tue, 03/10/2026 - 17:14

In-person class cancellation and work-from-home / Annulation des cours en présentiel et télétravail. McGILL ALERT! Due to freezing rain all in-person classes and activities on Wednesday, March 11, will be cancelled. Staff are asked not to come to campus tomorrow unless they are required on site by their supervisor to perform necessary functions and activities. See your McGill email for more information.
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ALERTE McGILL! En raison de la pluie verglaçante, tous les cours et activités en présentiel prévus pour le mercredi 11 mars sont annulés. Nous demandons au personnel de ne pas se présenter sur le campus demain, à moins que leur superviseur ne leur demande d’être sur place pour accomplir des fonctions ou activités nécessaires au fonctionnement du campus. Pour plus d’informations, veuillez consulter vos courriels de McGill.

Event

Maninder Dhanauta (McGill)

Wednesday, January 15, 2025 16:00to17:00

Burnside Hall Room 920, 805 rue Sherbrooke Ouest, Montreal, QC, H3A 0B9, CA

Title: Virtual cactus group is virtually special compact

Abstract: The cactus group has been studied in various settings, first appearing as a "mock reflection group". Its “pure” subgroup is the fundamental group of the iterative blowup of a hyperplane arrangement (the Deligne-Mumford space). The virtual cactus group is a modified version of the cactus group. In recent years, techniques from geometric group theory were used to determine properties of the cactus group. It was shown that the cactus group is virtually special compact. In this talk, we will present this viewpoint and prove that the virtual cactus group is also virtually special compact.

There will be teatime in the lounge after the talk at 5pm.

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#DepartmentofMathematicsandStatistics