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DTSTART;TZID=America/New_York:20261026T163000
DTEND;TZID=America/New_York:20261026T173000
DTSTAMP:20261013T151129Z
CREATED:20260729T200800Z
LAST-MODIFIED:20261013T151129Z
UID:10004030-1793032200-1793035800@live-hu-cmsa-222.pantheonsite.io
SUMMARY:The Geography of Symplectic 4-Manifolds
DESCRIPTION:Colloquium \nSpeaker: Anar Akhmedov\, University of Minnesota \nTitle: The Geography of Symplectic 4-Manifolds \nAbstract: The symplectic geography problem\, originally posed by J. McCarthy-J. Wolfson and R. Gompf\, asks which ordered pairs of nonnegative integers are realized as (\chi(X)\,c_1^2(X)) for a symplectic 4-manifold X\, where \chi(X)=(e(X)+\sigma(X))/4. In this talk\, we will address the geography of simply connected spin and nonspin symplectic 4-manifolds with small Euler characteristic\, with nonnegative signature\, or near the Bogomolov-Miyaoka-Yau line c_1^2(X)=9\chi_h(X). We will also discuss recent developments\, including joint work with Sai-Kee Yeung on symplectic fake quadrics and related questions motivated by fake projective planes and Cartwright-Steger surfaces. \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-102626/
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-10.26.2026.docx-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261102T163000
DTEND;TZID=America/New_York:20261102T173000
DTSTAMP:20261013T151219Z
CREATED:20260729T200831Z
LAST-MODIFIED:20261013T151219Z
UID:10004031-1793637000-1793640600@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Colloquium
DESCRIPTION:Colloquium \nSpeaker: Ivan Corwin (Columbia University) \n  \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-11226/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261109T163000
DTEND;TZID=America/New_York:20261109T173000
DTSTAMP:20261013T151232Z
CREATED:20260729T200854Z
LAST-MODIFIED:20261013T151232Z
UID:10004032-1794241800-1794245400@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Colloquium
DESCRIPTION:Colloquium \nSpeaker: Lukas Müller (LMU Munich) \n  \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-11926/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261116T163000
DTEND;TZID=America/New_York:20261116T173000
DTSTAMP:20261013T151243Z
CREATED:20260729T200924Z
LAST-MODIFIED:20261013T151243Z
UID:10004033-1794846600-1794850200@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
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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: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: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:20270201T163000
DTEND;TZID=America/New_York:20270201T173000
DTSTAMP:20261013T151343Z
CREATED:20260924T184143Z
LAST-MODIFIED:20261013T151343Z
UID:10004049-1801499400-1801503000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Colloquium
DESCRIPTION:Colloquium \nSpeaker: Nina Holden (NYU) \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_2127/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20270208T163000
DTEND;TZID=America/New_York:20270208T173000
DTSTAMP:20261013T151358Z
CREATED:20260922T152756Z
LAST-MODIFIED:20261013T151358Z
UID:10004048-1802104200-1802107800@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Colloquium
DESCRIPTION:Colloquium \nSpeaker: Giulio Biroli\, ENS Paris \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-2727/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
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