BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Drupal iCal API//EN X-WR-CALNAME:Events items teaser X-WR-TIMEZONE:America/Toronto BEGIN:VTIMEZONE TZID:America/Toronto X-LIC-LOCATION:America/Toronto BEGIN:DAYLIGHT TZNAME:EDT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 DTSTART:20260308T070000 END:DAYLIGHT BEGIN:STANDARD TZNAME:EST TZOFFSETFROM:-0400 TZOFFSETTO:-0500 DTSTART:20251102T060000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:6ab12c76325ab DTSTART;TZID=America/Toronto:20260924T153000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260924T163000 URL:https://uwaterloo.ca/pure-mathematics/events/geometry-topology-seminar- dominik-gutwein-moduli-space SUMMARY:Geometry & Topology Seminar | Dominik Gutwein | The moduli space of \nconically singular SU(3)-instantons CLASS:PUBLIC DESCRIPTION:DOMINIK GUTWEIN (UNIVERSITÄT HAMBURG) \n\n_The moduli space of conically singular SU(3)-instantons_ \nInstantons over manifolds with spe cial holonomy are a distinguished\nclass of connections on principal bundl es. In their seminal paper from\n1998 Donaldson and Thomas envisioned inva riants of special holonomy\nmanifolds based on the moduli space of such in stantons. However\, a\nrigorous construction of these invariants faces for midable challenges\narising from the possible non-compactness of this modu li space. One\nsource of non-compactness comes from the formation of non-r emovable\nsingularities\, that is\, a sequence of instantons might converg e to an\ninstanton that is singular along a subset of the underlying manif old.\nIn this talk\, I will focus on instantons over 6-manifolds with\nSU( 3)-structures that have isolated singularities of conical type. In\npartic ular\, I will discuss their moduli space\, its structure\, and its\nvirtua l dimension. This talk is based on joint work with Yuanqi Wang. \nMC 5417 DTSTAMP:20260921T130910Z END:VEVENT BEGIN:VEVENT UID:6ab12c76337ad DTSTART;TZID=America/Toronto:20260924T150000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260924T160000 URL:https://uwaterloo.ca/pure-mathematics/events/model-theory-seminar-yuton g-duan-strong-minimality-lotka SUMMARY:Model Theory Seminar | Yutong Duan | Strong minimality of\nLotka-Vo lterra system CLASS:PUBLIC DESCRIPTION:YUTONG DUAN (UNIVERSITY OF WATERLOO)\n\n_Strong minimality of L otka-Volterra system_ \nWe will begin with the notion of irreducibility fo r differential\nequations\, introduced by Painlevé in his search for new\ ntranscendental functions\, and explain its relationship with strong\nmini mality. We will then introduce the Lotka–Volterra system and try\nto sho w that\, under certain conditions on the parameters\, its degree\nof non-m inimality is zero\; by convention\, this means that its generic\ntype is m inimal. Finally\, we will show that the resulting strongly\nminimal set ha s trivial geometry\; moreover\, it is strictly\ndisintegrated. \nMC 5403 DTSTAMP:20260921T130910Z END:VEVENT BEGIN:VEVENT UID:6ab12c763462e DTSTART;TZID=America/Toronto:20260923T140000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260923T150000 URL:https://uwaterloo.ca/pure-mathematics/events/logic-analysis-working-sem inar-andy-zucker-brief SUMMARY:Logic in Analysis Working Seminar | Andy Zucker | Brief introductio n\nto forcing CLASS:PUBLIC DESCRIPTION:ANDY ZUCKER (UNIVERSITY OF WATERLOO)\n\n_Brief introduction to forcing_\n\nWith an eye towards working through the recent preprint by Aru lseelan\nand Hanson on AW*-algebras\, I will give a brief introduction to\ nset-theoretic forcing\, with a focus on Boolean-valued models.\n\nMC 5301 DTSTAMP:20260921T130910Z END:VEVENT BEGIN:VEVENT UID:6ab12c763556a DTSTART;TZID=America/Toronto:20260922T143000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260922T160000 URL:https://uwaterloo.ca/pure-mathematics/events/differential-geometry-work ing-seminar-viktor-majewski-non SUMMARY:Differential Geometry Working Seminar | Viktor Majewski |\nNon-Exis tence of Smooth Full-Holonomy Cayley Fibrations CLASS:PUBLIC DESCRIPTION:VIKTOR MAJEWSKI (UNIVERSITY OF WATERLOO) \n_Non-Existence of Sm ooth Full-Holonomy Cayley Fibrations_ \nIn this talk\, I complete the proo f that every Cayley fibration of a\ncompact torsion-free Spin(7)-manifold with full holonomy must have\nsingular fibers. This confirms a long-standi ng expectation in the\nstudy of calibrated fibrations with exceptional hol onomy. Last\nsemester\, I showed that using the rigidity of the Spin(7)-st ructure to\nreduce any hypothetical nonsingular Cayley fibration to two po ssible\ntopological configurations. This time\, I exclude both by proving a new\nspinnability theorem for smooth fiber bundles over simply-connected \n4-manifolds with fiber homeomorphic to the elliptic surfaces E(2) or\nE( 4). The E(4) case\, which constitutes the main new difficulty\, is\nestabl ished by combining families Seiberg–Witten theory with\nparametrized equ ivariant homotopy theory and equivariant K-theory. \nMC 5417 DTSTAMP:20260921T130910Z END:VEVENT BEGIN:VEVENT UID:6ab12c7636816 DTSTART;TZID=America/Toronto:20260924T133000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260924T150000 URL:https://uwaterloo.ca/pure-mathematics/events/computability-learning-sem inar-joey-lakerdas-gayle-pairs SUMMARY:Computability Learning Seminar | Joey Lakerdas-Gayle | The Pairs of \nStructures Theorem CLASS:PUBLIC DESCRIPTION:JOEY LAKERDAS-GAYLE (UNIVERSITY OF WATERLOO) \n_The Pairs of St ructures Theorem_ \nWe will finish the proof of the Pairs of Structures th eorem using the\nGame Metatheorem. \nMC 5301 DTSTAMP:20260921T130910Z END:VEVENT BEGIN:VEVENT UID:6ab12c763793b DTSTART;TZID=America/Toronto:20260921T143000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260921T153000 URL:https://uwaterloo.ca/pure-mathematics/events/pure-mathematics-colloquiu m-hunter-sprink-forest-polynomials SUMMARY:Pure Mathematics Colloquium | Hunter Sprink | Forest polynomials an d\nquasisymmetry CLASS:PUBLIC DESCRIPTION:HUNTER SPRINK (UNIVERSITY OF TORONTO)\n\n_Forest polynomials an d quasisymmetry_\n\nIn this talk I will introduce the combinatorics behind some new\nconnections between the classical notion of quasisymmetry in al gebraic\ncombinatorics to the geometry of the flag variety.\n\nMC 5501 DTSTAMP:20260921T130910Z END:VEVENT BEGIN:VEVENT UID:6ab12c7638ef3 DTSTART;TZID=America/Toronto:20260918T110000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260918T120000 URL:https://uwaterloo.ca/pure-mathematics/events/algebraic-geometry-working -seminar-catherine-st-pierre SUMMARY:Algebraic Geometry Working Seminar | Catherine St-Pierre |\nOrganiz ational Meeting CLASS:PUBLIC DESCRIPTION:CATHERINE ST-PIERRE (UNIVERSITY OF WATERLOO)\n\n_Organizational Meeting_\n\nWe will discuss the seminar format and plan the talks for the session.\n\nMC 5403 DTSTAMP:20260921T130910Z END:VEVENT BEGIN:VEVENT UID:6ab12c7639e39 DTSTART;TZID=America/Toronto:20260917T150000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260917T160000 URL:https://uwaterloo.ca/pure-mathematics/events/model-theory-seminar-yuton g-duan-strongly-minimal-sets-dcf0 SUMMARY:Model Theory Seminar | Yutong Duan | Strongly Minimal Sets in DCF_0 CLASS:PUBLIC DESCRIPTION:YUTONG DUAN (UNIVERSITY OF WATERLOO)\n\n_Strongly Minimal Sets in DCF_0_\n\nWe introduce the theory of differentially closed fields of\nc haracteristic zero (DCF_0) and the pregeometry associated with\nminimal ty pes\, and explain how strong minimality connects questions\nabout ordinary differential equations with model theory.\n\nMC 5403 DTSTAMP:20260921T130910Z END:VEVENT BEGIN:VEVENT UID:6ab12c763abf6 DTSTART;TZID=America/Toronto:20260916T103000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260916T113000 URL:https://uwaterloo.ca/pure-mathematics/events/birational-geometry-learni ng-seminar-kaleb-d-ruscitti-blow SUMMARY:Birational Geometry Learning Seminar | Kaleb D Ruscitti | Blow ups and\nCastelnuovo's Theorem CLASS:PUBLIC DESCRIPTION:KALEB D RUSCITTI (UNIVERSITY OF WATERLOO) \n\n_Blow ups and Cas telnuovo's Theorem_ \n\nThis week we are discussing: \nVakil section 28.6\ , \nHartshorne V.3\, \nKollar-Mori \"Introduction\"\, \nfocusing on blow u ps of surfaces and Castelnuovo's theorem. \nMC 5301 DTSTAMP:20260921T130910Z END:VEVENT BEGIN:VEVENT UID:6ab12c763bbb6 DTSTART;TZID=America/Toronto:20260916T143000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260916T153000 URL:https://uwaterloo.ca/pure-mathematics/events/pure-mathematics-colloquiu m-yasuyuki-kawahigashi-operator SUMMARY:Pure Mathematics Colloquium | Yasuyuki Kawahigashi | Operator\nalge bras\, conformal field theory and condensed matter physics CLASS:PUBLIC DESCRIPTION:YASUYUKI KAWAHIGASHI (UNIVERSITY OF TOKYO)\n\n_Operator algebra s\, conformal field theory and condensed matter\nphysics_\n\nWe present an operator algebraic approach to conformal field theory\nin connection to other topics such as vertex operator algebras\,\nquantum groups and quantu m invariants in low-dimensional topology\,\nwhich started with subfactor t heory of Jones. We then present recent\nadvances on similar mathematical s tructures that appear in\ntwo-dimensional condenses matter physics such as quantum spin systems\,\ntensor networks and topological quantum computati on. No knowledge on\noperator algebras are assumed. \nMC 5479 DTSTAMP:20260921T130910Z END:VEVENT END:VCALENDAR