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BEGIN:VTIMEZONE
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BEGIN:DAYLIGHT
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DTSTART:20250309T070000
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261207T163000
DTEND;TZID=America/New_York:20261207T173000
DTSTAMP:20261013T151319Z
CREATED:20260729T201051Z
LAST-MODIFIED:20261013T151319Z
UID:10004036-1796661000-1796664600@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Colloquium
DESCRIPTION:Colloquium \nSpeaker: Roberto De Leo\, Howard University \n  \n  \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium-12726/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261204T120000
DTEND;TZID=America/New_York:20261204T130000
DTSTAMP:20260729T193405Z
CREATED:20260729T193405Z
LAST-MODIFIED:20260729T193405Z
UID:10004008-1796385600-1796389200@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Member Seminar
DESCRIPTION:Member Seminar \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/member-seminar-12426/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Member Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261203T163000
DTEND;TZID=America/New_York:20261203T173000
DTSTAMP:20260729T200349Z
CREATED:20260729T200349Z
LAST-MODIFIED:20260729T200349Z
UID:10004029-1796315400-1796319000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Differential Geometry and Physics Seminar
DESCRIPTION:Differential Geometry and Physics Seminar  \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/dgphys_12326-2/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Geometry and Mathematical Physics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261203T163000
DTEND;TZID=America/New_York:20261203T173000
DTSTAMP:20260811T153908Z
CREATED:20260709T160232Z
LAST-MODIFIED:20260811T153908Z
UID:10003971-1796315400-1796319000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Geometry and Mathematical Physics seminar
DESCRIPTION:Geometry and Mathematical Physics seminar \nSpeaker: Paul Feehan\, Rutgers University \nTitle: TBA
URL:https://live-hu-cmsa-222.pantheonsite.io/event/dgphys_12326/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Geometry and Mathematical Physics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261202T163000
DTEND;TZID=America/New_York:20261202T173000
DTSTAMP:20260824T140851Z
CREATED:20260729T161127Z
LAST-MODIFIED:20260824T140851Z
UID:10003970-1796229000-1796232600@live-hu-cmsa-222.pantheonsite.io
SUMMARY:AI for the Working Mathematician
DESCRIPTION:AI for the Working Mathematician \nSpeaker: Mark Selke\, Harvard \nTitle: TBA
URL:https://live-hu-cmsa-222.pantheonsite.io/event/ai_12226/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:AI for the Working Mathematician
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261202T140000
DTEND;TZID=America/New_York:20261202T150000
DTSTAMP:20260929T174005Z
CREATED:20260729T194554Z
LAST-MODIFIED:20260929T174005Z
UID:10004019-1796220000-1796223600@live-hu-cmsa-222.pantheonsite.io
SUMMARY:New Technologies in Mathematics Seminar
DESCRIPTION:New Technologies in Mathematics Seminar \nSpeaker: Pierre Ablin (Apple)
URL:https://live-hu-cmsa-222.pantheonsite.io/event/newtech_12226/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:New Technologies in Mathematics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261201T161500
DTEND;TZID=America/New_York:20261201T180000
DTSTAMP:20260729T192550Z
CREATED:20260729T192550Z
LAST-MODIFIED:20260729T192550Z
UID:10003997-1796141700-1796148000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Geometry and Quantum Theory Seminar
DESCRIPTION:Joint Math/CMSA Geometry and Quantum Theory Seminar \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/quantumgeo_12126/
LOCATION:Science Center 507\, 1 Oxford Street\, Cambridge\, 02138
CATEGORIES:Geometry and Quantum Theory Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261130T163000
DTEND;TZID=America/New_York:20261130T173000
DTSTAMP:20261013T151306Z
CREATED:20260729T201026Z
LAST-MODIFIED:20261013T151306Z
UID:10004035-1796056200-1796059800@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Colloquium
DESCRIPTION:Colloquium \n  \n  \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium-113026/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261130T163000
DTEND;TZID=America/New_York:20261130T173000
DTSTAMP:20261102T133025Z
CREATED:20260729T200924Z
LAST-MODIFIED:20261102T133025Z
UID:10004033-1796056200-1796059800@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Snake graphs and q-deformed real numbers
DESCRIPTION:Colloquium \nSpeaker: James Propp (UMass Lowell) \nTitle: Snake graphs and q-deformed real numbers \nAbstract: I’ll present a statistical-mechanical construction of q-deformed real numbers [[x]]_q\, inspired by the q-deformed rational numbers [x]_q of Morier-Genoud and Ovsienko. The new construction admits two equivalent formulations: one in terms of random filters in snake posets and the other in terms of random dimer covers of snake graphs. \nI’ll begin with a combinatorial approach to Stern’s diatomic series and the Calkin–Wilf bijection via finite snake graphs\, and then construct q-deformed rational numbers by introducing an activity parameter q into the model. I extend from q-deformed rationals to q-deformed reals by passing from finite to infinite snake graphs; the main technical step is to show that the associated limiting probability measures are well defined. \nThe resulting q-deformation [[x]]_q satisfies [[x]]_1 = x for all x>0. There’s evidence that\, wherever both [x]_q and [[x]]_q are defined\, [[x]]_q = q [x]_q. For more details\, see arXiv:2607.14332. \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium-111626/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://live-hu-cmsa-222.pantheonsite.io/media/2026/07/CMSA-Colloquium-11.16.2026.docx-1-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261125T140000
DTEND;TZID=America/New_York:20261125T150000
DTSTAMP:20260929T173939Z
CREATED:20260729T194526Z
LAST-MODIFIED:20260929T173939Z
UID:10004018-1795615200-1795618800@live-hu-cmsa-222.pantheonsite.io
SUMMARY:New Technologies in Mathematics Seminar
DESCRIPTION:New Technologies in Mathematics Seminar \nSpeaker:Julia Kempe (NYU)
URL:https://live-hu-cmsa-222.pantheonsite.io/event/newtech_112526/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:New Technologies in Mathematics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261124T161500
DTEND;TZID=America/New_York:20261124T180000
DTSTAMP:20261001T205203Z
CREATED:20260729T192523Z
LAST-MODIFIED:20261001T205203Z
UID:10003996-1795536900-1795543200@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Geometry and Quantum Theory Seminar
DESCRIPTION:Joint Math/CMSA Geometry and Quantum Theory Seminar \nSpeaker: Yosuke Kubota\, Kyoto University
URL:https://live-hu-cmsa-222.pantheonsite.io/event/quantumgeo_112426/
LOCATION:Science Center 507\, 1 Oxford Street\, Cambridge\, 02138
CATEGORIES:Geometry and Quantum Theory Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261123T163000
DTEND;TZID=America/New_York:20261123T173000
DTSTAMP:20261013T151255Z
CREATED:20260729T200958Z
LAST-MODIFIED:20261013T151255Z
UID:10004034-1795451400-1795455000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Colloquium
DESCRIPTION:Colloquium \nSpeaker: Ewain Gwynne\, U Chicago \n  \n  \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium-112326/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261121T090000
DTEND;TZID=America/New_York:20261121T170000
DTSTAMP:20261027T134036Z
CREATED:20261015T145844Z
LAST-MODIFIED:20261027T134036Z
UID:10004057-1795251600-1795280400@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Doing Mathematics with AI Agents
DESCRIPTION:Doing Mathematics with AI Agents \nDate: Saturday\, November 21\, 2026 \nTime: 9:00–5:00 pm ET \nLocation:  Zimmer Hall (Science Center)\, 1 Oxford Street\, Cambridge MA \n  \nThis is a one day workshop for Boston-area mathematics postdocs to work with AI agents in a collaborative environment (designed by Andrew Sutherland) supported by computational infrastructure and formalization tools. \nThis event is appropriate for: \n\nMathematics postdocs who haven’t used AI seriously in their work and want to try\nMathematics postdocs who have only worked with AI in chat in a web browser\nMathematics postdocs who already use Codex or Claude Code\n\nParticipants will work in a system where they can work with multiple agents\, and do mathematics assisted by AI agents during the day of the workshop.  Participants will work with AI agents who are fully set up to do mathematics\, and will talk to other colleagues who are doing the same thing in real time.  The landscape of using AI agents in mathematics is changing incredibly quickly.  At this workshop\, participants can experiment and learn from others about the possibilities and challenges in what is currently available. \nOnly mathematics postdocs are eligible for this event.\nNo funding is available.  We expect participants to be local.\n\nApply here if you are interested to participate.  Space is limited.  Applications will be considered on a rolling basis starting October 30.\n\nOrganizers: Melanie Matchett Wood (Harvard)\, Andrew Sutherland (MIT)\, Saman Habibi Esfahani (Harvard CMSA)\, and Michał Szachniewicz (Harvard). \n  \n\nThis event is cosponsored by the Harvard Mathematics Department and the CMSA. No financial support is available at this time. \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/mathai_112126/
LOCATION:Zimmer Hall (Science Center)\, 1 Oxford Street\, Cambridge\, MA\, 02138
CATEGORIES:Workshop
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261120T120000
DTEND;TZID=America/New_York:20261120T130000
DTSTAMP:20260729T193339Z
CREATED:20260729T193339Z
LAST-MODIFIED:20260729T193339Z
UID:10004007-1795176000-1795179600@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Member Seminar
DESCRIPTION:Member Seminar \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/member-seminar-112026/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Member Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261119T163000
DTEND;TZID=America/New_York:20261119T173000
DTSTAMP:20260819T144137Z
CREATED:20260729T200318Z
LAST-MODIFIED:20260819T144137Z
UID:10004028-1795105800-1795109400@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Geometry and Mathematical Physics seminar
DESCRIPTION:Geometry and Mathematical Physics seminar \nSpeaker: Joshua Greene\, Boston College
URL:https://live-hu-cmsa-222.pantheonsite.io/event/dgphys_111926/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Geometry and Mathematical Physics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261118T163000
DTEND;TZID=America/New_York:20261118T173000
DTSTAMP:20260929T140623Z
CREATED:20260729T161121Z
LAST-MODIFIED:20260929T140623Z
UID:10003969-1795019400-1795023000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:AI for the Working Mathematician
DESCRIPTION:AI for the Working Mathematician \nSpeaker: Ken Ono\, Axiom Math and University of Virginia \nTitle: TBA
URL:https://live-hu-cmsa-222.pantheonsite.io/event/ai_111826/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:AI for the Working Mathematician
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261118T140000
DTEND;TZID=America/New_York:20261118T150000
DTSTAMP:20260729T194502Z
CREATED:20260729T194502Z
LAST-MODIFIED:20260729T194502Z
UID:10004017-1795010400-1795014000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:New Technologies in Mathematics Seminar
DESCRIPTION:New Technologies in Mathematics Seminar \nSpeaker: tba
URL:https://live-hu-cmsa-222.pantheonsite.io/event/newtech_111826/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:New Technologies in Mathematics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261118T120000
DTEND;TZID=America/New_York:20261118T130000
DTSTAMP:20261102T194947Z
CREATED:20261102T194844Z
LAST-MODIFIED:20261102T194947Z
UID:10004060-1795003200-1795006800@live-hu-cmsa-222.pantheonsite.io
SUMMARY:The work of Jacob Tsimerman (ICM series)
DESCRIPTION:CMSA Q&A Seminar \nSpeaker: Aaron Landesman (Harvard CMSA) \nTitle: The work of Jacob Tsimerman (ICM series) \nAbstract: I will discuss some basics of the Fields Medal work of Jacob Tsimerman. Some of his key contributions come toward the André-Oort conjecture\, algebraicity of period maps\, and arithmetic statistics.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/cmsaqa_111826/
LOCATION:Common Room\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:CMSA Q&A Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261117T140000
DTEND;TZID=America/New_York:20261117T160000
DTSTAMP:20260829T181930Z
CREATED:20260819T195033Z
LAST-MODIFIED:20260829T181930Z
UID:10004039-1794924000-1794931200@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Mathematical Economics Seminar: Experimental Design in Networks
DESCRIPTION:Speaker: Christopher Harshaw (c.harshaw@columbia.edu)\, Columbia University \nTitle: Design-Based Minimax Theory for Network Experiments \nAbstract: Network experiments are used throughout the social and medical sciences to investigate causal effects under the presence of interference. While a large body of work has developed improved statistical procedures\, the fundamental limits of statistical estimation in these settings is less well understood. In this paper\, we develop and investigate a design-based theory of minimax risk for network experiments under an arbitrary neighborhood interference model. Our notion of minimax risk describes the optimal precision among all statistical procedures for investigating a particular causal effect on the observed interference network. We show that the minimax risk is a function of the corresponding conflict graph\, which captures inherent unobservability of estimand-relevant potential outcomes given the observed interference network. Our main contribution is a series of upper and lower bounds on the minimax rate in terms of local and global connectivity properties of the conflict graph. To illustrate their utility\, we apply these general results to obtain minimax analyses for two commonly studied effects: the direct treatment effect and global average treatment effect. \n  \nSpeaker: Evan Munro (evan.munro@chicagobooth.edu)\, University of Chicago\, Booth School of Business \nTitle: Robust Signal Maximization in Spillover Experiments \nAbstract: We study the optimal design and analysis of experiments for estimating spillover effects. Assuming a known (e.g.\, linear) exposure mapping\, we characterize the treatment-assignment distribution and regression-based estimator that minimize worst-case asymptotic variance against a broad class of distributions of unobservables. The design problem yields an intuitive solution in which the planner trades off spillover signal strength against diffusion of spillover variation. The analysis problem yields a simple recentered instrumental variable estimator to best leverage this variation. This framework produces natural solutions in several benchmark cases – such as clustered exposure – and suggests computationally tractable approximations for general networks\, including bipartite settings. We illustrate these new tools in semi-synthetic experiments based on two applications from development economics. Our approach yields large standard error reductions in both experiments\, increasing effective sample sizes by 50-100% or more.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/mathecon_111726/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Mathematical Economics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261113T120000
DTEND;TZID=America/New_York:20261113T130000
DTSTAMP:20261001T185955Z
CREATED:20260729T193314Z
LAST-MODIFIED:20261001T185955Z
UID:10004006-1794571200-1794574800@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Member Seminar
DESCRIPTION:Member Seminar \nSpeaker: Saman Habibi Esfahani
URL:https://live-hu-cmsa-222.pantheonsite.io/event/member-seminar-111326/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Member Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261112T163000
DTEND;TZID=America/New_York:20261112T173000
DTSTAMP:20261005T144052Z
CREATED:20260729T200250Z
LAST-MODIFIED:20261005T144052Z
UID:10004027-1794501000-1794504600@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Geometry and Mathematical Physics Seminar
DESCRIPTION:Geometry and Mathematical Physics Seminar \nSpeaker: Roland Bittleston (Harvard)
URL:https://live-hu-cmsa-222.pantheonsite.io/event/dgphys_111226/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Geometry and Mathematical Physics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261111T140000
DTEND;TZID=America/New_York:20261111T150000
DTSTAMP:20261002T132412Z
CREATED:20261002T130921Z
LAST-MODIFIED:20261002T132412Z
UID:10004053-1794405600-1794409200@live-hu-cmsa-222.pantheonsite.io
SUMMARY:New Technologies in Mathematics Seminar
DESCRIPTION:New Technologies in Mathematics Seminar \nSpeaker: Johannes von Oswald (Google)
URL:https://live-hu-cmsa-222.pantheonsite.io/event/newtech_111126/
LOCATION:Virtual
CATEGORIES:New Technologies in Mathematics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261110T161500
DTEND;TZID=America/New_York:20261110T180000
DTSTAMP:20260729T191011Z
CREATED:20260729T191011Z
LAST-MODIFIED:20260729T191011Z
UID:10003993-1794327300-1794333600@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Geometry and Quantum Theory Seminar
DESCRIPTION:Joint Math/CMSA Geometry and Quantum Theory Seminar \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/quantumgeo_111026/
LOCATION:Science Center 507\, 1 Oxford Street\, Cambridge\, 02138
CATEGORIES:Geometry and Quantum Theory Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261109T163000
DTEND;TZID=America/New_York:20261109T173000
DTSTAMP:20261029T140252Z
CREATED:20260729T200854Z
LAST-MODIFIED:20261029T140252Z
UID:10004032-1794241800-1794245400@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Unitary extended topological field theories and higher Hermitian objects
DESCRIPTION:Colloquium \nSpeaker: Lukas Müller (LMU Munich) \nTitle: Unitary extended topological field theories and higher Hermitian objects \nAbstract: Mathematically\, topological field theories study the representation theory of manifolds undercutting and gluing. Extended topological field theories take this idea a step further by allowing one to cut manifolds in multiple directions\, leading to a formulation in terms of higher category theory. It is an open problem to give a complete definition and description of unitary representations of manifolds as extended topological field theories. \nIn my talk\, I will explain some recent progress towards the definition and classification of unitary extended topological field theories. This is based on a categorification of the concept of a Hermitian object in a rigid symmetric monoidal category\, introduced by Freed and Hopkins in the study of non-extended unitary topological field theories. \nThe talk is based on several joint works involving (in part) Giovanni Ferrer\, Brett Hungar\, Theo Johnson-Freyd\, Cameron Krulewski\, Nivedita\, David Penneys\, David Reutter\, Claudia Scheimbauer\, Luuk Stehouwer\, and Chetan Vuppulury\, as well as ongoing work with Theo Johnson-Freyd\, Cameron Krulewski\, and Luuk Stehouwer. \n  \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium-11926/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://live-hu-cmsa-222.pantheonsite.io/media/2026/07/CMSA-Colloquium-11.9.2026.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261106T120000
DTEND;TZID=America/New_York:20261106T130000
DTSTAMP:20260729T193251Z
CREATED:20260729T193251Z
LAST-MODIFIED:20260729T193251Z
UID:10004005-1793966400-1793970000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Member Seminar
DESCRIPTION:Member Seminar \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/member-seminar-11626/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Member Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261106T090000
DTEND;TZID=America/New_York:20261107T170000
DTSTAMP:20261102T230149Z
CREATED:20260423T160818Z
LAST-MODIFIED:20261102T230149Z
UID:10003936-1793955600-1794070800@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Northeast Conference on Categorical Methods
DESCRIPTION:Northeast Conference on Categorical Methods \nDates: November 6–​7\, 2026  \nLocation: CMSA G10\, 20 Garden St.\, Cambridge MA 02138 \n\n\n\n\nThis conference is intended to bring together researchers in all areas of mathematics and mathematical physics whose work involves the use of methods from categorical algebra\, abstract homotopy theory\, and higher category theory. Our goal is to showcase new\, exciting research and offer an avenue for researchers from the Northeast US to discuss their work and collaborate with people in this ever-growing community. \n\nThere will be time for 4 short talks by early-career mathematicians. \n\n\n  \n\n\nRegistration for in-person participation and funding is now closed. \nRemote participation is still available. Sign up using this link: Zoom Webinar Registration \n\n\n\nCambridge Links \n\nRecommended Lodging\nRestaurants\nTransportation: MBTA\n\n\n\n\nInvited Speakers \n\nAndrew Blumberg\, Columbia University\nSoren Galatius\, Columbia University\nTony Pantev\, University of Pennsylvania\nNick Rozenblyum\, University of Toronto\nTomer Schlank\, Harvard University\nBrian Williams\, Boston University\nInna Zakharevich\, Cornell University\n\n\nEarly-career Speakers \n\nAlexandra Ballow\, Montana State University\nConnor Malin\, MPIM\nAzélie Picot\, Columbia University\nShubhankar Sahai\, UCSD\n\n\n\n  \n\n\n\n\nOrganized by Dan Freed\, Harvard Math & CMSA; Owen Gwilliam\, UMass Amherst; and Lorenzo Riva\, Harvard CMSA \n\n  \nSchedule\nFriday\, November 6\, 2027\n8:30 – 9:00 am\nBreakfast \n9:00 – 10:00 am\nTomer Schlank\, Harvard\ntba \n10:00 – 10:15 am\nBreak \n10:15 – 11:15 am\nTony Pantev\, University of Pennsylvania\nTitle: The pushforward theorem and its applications\nAbstract: I will discuss the notion of a relative shifted symplectic structure along the stalks of a constructible sheaf of derived stacks on a stratified space. I will describe a general pushforward theorem producing relative shifted symplectic forms and will explain explicit techniques for computing such forms. As an application I will describe a universal construction of Poisson structures on derived moduli of Stokes data on smooth varieties and will explain how symplectic leaves arise from fixing irregular types and local formal monodromies at infinity. This is a joint work with Dima Arinkin and Bertrand Toen. \n11:15 – 11:30 am\nBreak \n11:30 am – 12:00 pm\nAzelie Picot\, Columbia\nTitle: The cobordism category for Poincaré Duality spaces\nAbstract: Cobordism categories conveniently package closed manifolds of a given dimension as objects and moduli spaces of their cobordisms as morphisms. On the other hand\, Poincaré duality spaces are spaces whose homology satisfies Poincaré duality. We can again define a cobordism category for Poincaré duality spaces. In this talk\, I will discuss some of its key features. \n12:00 – 1:30 pm\nBreak \n1:30 – 2:00 pm\nConnor Malin\, MPIM Bonn\ntba \n2:00 – 2:15 pm\nBreak \n2:15 – 3:15 pm\nBrian Williams\, Boston University\nTitle: Higher central charges and a universal Grothendieck–Riemann–Roch theorem\nAbstract: Mumford’s computation of determinant line bundles in CFT relates the Virasoro central charge to the geometry of moduli spaces of curves. In joint work with Zhengping Gui\, we prove a local\, universal Grothendieck–Riemann–Roch theorem extending this relationship to higher dimensions. Our categorical starting point is the functorial construction of Tate complexes from derived sections of natural bundles on punctured formal disks. We compute the induced central extension of global derived vector fields in terms of the Todd class and Chern character\, connecting categorical determinant constructions with higher Virasoro symmetries and anomalies in holomorphic QFT. \n3:15 – 3:30 pm\nBreak \n3:30 – 4:30 pm\nInna Zakharevich\, Cornell\nTitle: “The category of schemes is abelian” and other obviously-false true statements\nAbstract: The category of schemes is clearly not abelian\, as\, for example\, there is no additive structure on the hom-sets of the category. However\, from the perspective of algebraic K-theory\, there turn out to be many respects in which the category of schemes behaves akin to an abelian category. In this talk we will discuss the notion of an “ACGW category\,” which is a generalizations of abelian categories which allows us to use the methods of abelian categories inside the category of schemes. In particular\, we will prove Quillen’s d\’evissage for ACGW-categories and explain implications of this to analyses inside combinatorial K-theory. \n  \nSaturday\, November 7\, 2026\n8:30–9:00 am\nBreakfast \n9:00 – 10:00 am\nAndrew Blumberg\, Columbia\ntba \n10:00 – 10:15 am\nBreak \n10:15 – 11:15 am\nSoren Galatius\, Columbia\ntba \n11:15 – 11:30 am\nBreak \n11:30 am– 12:00 pm\nAlexandra Ballow\, Montana State University\nTitle: Derived Turaev-Viro\nAbstract: We aim to integrate a 2-category over a (framed) surface: this is a purely combinatorial implementation of factorization homology. We will discuss intuitively what factorization homology is\, focusing first on a combinatorial definition of factorization homology over the circle. This example is interesting in its own right as a generalized Hochschild homology. To extend this definition to surfaces\, we define 2-dimensional quivers and consider representations of such in a 2-category. We finish with a discussion of string-nets to motivate the correspondence between factorization homology of a surface and a version of the TQFT Turaev-Viro on surfaces. \n12:00 – 1:30 pm\nBreak \n1:30 – 2:00 pm\nShubhankar Sahai\, UCSD\nTitle: Tannakian reconstruction in derived algebraic geometry\nAbstract: In the early 2010s\, Lurie\, Bhatt and Bhatt–Halpern-Leistner (building on a ‘relative’ perspective introduced by Lurie a decade earlier) proved strong reconstruction results for maps of spectral stacks from (certain) symmetric monoidal functors between their derived categories of quasi-coherent sheaves. Motivated by recent work in p-adic Hodge theory and Hochschild homology\, one asks whether such reconstruction results exist in derived geometry\, where the basic geometric objects are spectra of animated (i.e. simplicial commutative) rings rather than E_\infty-rings. In this talk we will explain how to answer this question positively using the recently invented Theta-categories of Nuiten–Toën. This is joint work with Joshua Mundinger. \n2:00 – 2:15 pm\nBreak \n2:15 – 3:15 pm\nNick Rozenbluym\, University of Toronto\nTitle: Categorical representations and higher traces\nAbstract: I will give an overview of the theory of categorical representations of algebraic groups and relate them to ordinary representations via higher categorical trace. This procedure allows to extract concrete consequences of higher structures. For instance\, I will explain how the theory of iterated traces applied to an appropriate (∞\,3)-category gives a conceptual proof of a character formula for Deligne-Lusztig representations of finite groups of Lie type. This is joint work with D. Gaitsgory and Y. Varshavsky.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/cm/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Workshop
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261105T163000
DTEND;TZID=America/New_York:20261105T173000
DTSTAMP:20261102T141611Z
CREATED:20260729T200203Z
LAST-MODIFIED:20261102T141611Z
UID:10004026-1793896200-1793899800@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Recent developments in super geometry
DESCRIPTION:Geometry and Mathematical Physics Seminar  \nSpeaker: Ron Donagi\, University of Pennsylvania \nTitle: Recent developments in super geometry \nAbstract: String theory leads naturally to consideration of Super Riemann surfaces and their super moduli spaces. Much of the classical theory of curves and their moduli\, e.g. existence of a Deligne-Mumford compactification\, has natural super-analogues. But a number of new features arise\, e.g. there are two distinct analogues of a marked point: Neveu-Schwarz and Ramond punctures. We will explore this analogy and emphasize some of the new features\, such as non-projectedness\, the super Schottky problem\, and the super measure.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/dgphys_11526/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Geometry and Mathematical Physics Seminar
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261104T163000
DTEND;TZID=America/New_York:20261104T173000
DTSTAMP:20261019T133021Z
CREATED:20260729T161116Z
LAST-MODIFIED:20261019T133021Z
UID:10003968-1793809800-1793813400@live-hu-cmsa-222.pantheonsite.io
SUMMARY:AI for the Working Mathematician
DESCRIPTION:AI for the Working Mathematician \nSpeaker: Andrew Sutherland\, MIT \nTitle: TBA
URL:https://live-hu-cmsa-222.pantheonsite.io/event/ai_11426/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:AI for the Working Mathematician,Colloquia & Seminar
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261104T140000
DTEND;TZID=America/New_York:20261104T150000
DTSTAMP:20261102T224933Z
CREATED:20260729T194242Z
LAST-MODIFIED:20261102T224933Z
UID:10004016-1793800800-1793804400@live-hu-cmsa-222.pantheonsite.io
SUMMARY:On the emergence of representational geometry from the statistics of natural language
DESCRIPTION:New Technologies in Mathematics Seminar \nSpeaker: Yasaman Bahri (Google DeepMind) \nTitle: On the emergence of representational geometry from the statistics of natural language \nAbstract: Large language models organize their internal representations into rich geometric structures that mirror the concepts of natural language. For example\, categorical concepts often map to linear directions\, while words and phrases having a notion of space or time trace out winding manifolds. Remarkably\, these geometries emerge across diverse settings despite differences in neural architecture and training algorithms. Further\, this representational structure is key to understanding how models perform computations. What is the origin of this universal geometry? We turn to simpler models of language — classic word embedding methods — to shed light on this question. We develop a theoretical framework for the co-occurrence statistics of natural language whose predictions show striking agreement with empirical findings. Our work provides a unified explanation for prior observations of representational geometry and a rigorous foundation for further theoretical development.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/newtech_11426/
LOCATION:Virtual
CATEGORIES:New Technologies in Mathematics Seminar
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261104T120000
DTEND;TZID=America/New_York:20261104T130000
DTSTAMP:20261102T141008Z
CREATED:20261006T135023Z
LAST-MODIFIED:20261102T141008Z
UID:10004054-1793793600-1793797200@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Can Math Mend a Broken Heart?
DESCRIPTION:CMSA Q&A Seminar \nSpeaker: Wes Cain\, Harvard \nTitle: Can Math Mend a Broken Heart? \nAbstract: I will discuss an abnormal cardiac rhythm known as T-wave alternans\, and a simple feedback control method (time-delay autosynchronization\, TDAS) that has been used successfully to suppress alternans experimentally. Variants of TDAS have been used for chaos control and prevention of period-doubling bifurcation in physical systems. I will explain how basic ideas from dynamical systems (e.g.\, the contraction mapping principle and Lyapunov functions) can be used to explore the robustness of TDAS. \n  \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/cmsaqa_11426/
LOCATION:Common Room\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:CMSA Q&A Seminar
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