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:20261101T060000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:6ae8ae8cce953 DTSTART;TZID=America/Toronto:20261105T133000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20261105T150000 URL:https://uwaterloo.ca/pure-mathematics/events/computability-learning-sem inar-beining-mu-jump-structure-iv SUMMARY:Computability Learning Seminar | Beining Mu | Jump of a structure I V CLASS:PUBLIC DESCRIPTION:BEINING MU (UNIVERSITY OF WATERLOO) \n_Jump of a structure IV_ \nWe will continue working with the jump inversion theorem for\nstructures . \nMC 5403 DTSTAMP:20261102T153852Z END:VEVENT BEGIN:VEVENT UID:6ae8ae8cd1af8 DTSTART;TZID=America/Toronto:20261103T143000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20261103T160000 URL:https://uwaterloo.ca/pure-mathematics/events/differential-geometry-work ing-seminar-faisal-romshoo-flows SUMMARY:Differential Geometry Working Seminar | Faisal Romshoo | Flows of\n positive triples CLASS:PUBLIC DESCRIPTION:FAISAL ROMSHOO (UNIVERSITY OF WATERLOO) \n\n_Flows of positive triples_ \nWe will discuss positive triples on a 4-manifold and the\nrepre sentation theory that arises from these structures. I will also\naim to ta lk about the notion of an \"isometric flow\" of positive\ntriples\, which will be a negative gradient flow of a natural energy\nfunctional restricte d to the \"isometric class\" of positive triples. \nMC 5417 DTSTAMP:20261102T153852Z END:VEVENT BEGIN:VEVENT UID:6ae8ae8cd2e58 DTSTART;TZID=America/Toronto:20261105T150000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20261105T160000 URL:https://uwaterloo.ca/pure-mathematics/events/model-theory-seminar-rahim -moosa-around-wild-automorphism SUMMARY:Model Theory Seminar | Rahim Moosa | Around the wild automorphism\n conjecture CLASS:PUBLIC DESCRIPTION:RAHIM MOOSA (UNIVERSITY OF WATERLOO)\n\n_Around the wild automo rphism conjecture_\n\nThe wild automorphism conjecture\, of Reichstein\, R ogalski\, and Zhang\nfrom 2006\, proposes that if a projective algebraic v ariety X (in\ncharacteristic zero) admits an automorphism that leaves no p roper\nsubvariety invariant then X is an abelian variety. I will discuss\n recent work with Jason Bell where we use tools from the model theory\nof d ifference fields (developed last year by Moshe Kamensky and I) to\nresolve the “compound fundamental isotrivial” case. I will also\ngive a count erexample to the naive nonautonomous generalisation of the\nconjecture\, e xhibiting some of the difficulties in applying a\nmodel-theoretic analysis .\n\nMC 5403 DTSTAMP:20261102T153852Z END:VEVENT BEGIN:VEVENT UID:6ae8ae8cd460a DTSTART;TZID=America/Toronto:20261105T153000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20261105T163000 URL:https://uwaterloo.ca/pure-mathematics/events/geometry-and-topology-semi nar-cameron-krulewski-invertible SUMMARY:Geometry and Topology Seminar | Cameron Krulewski | Invertible Fiel d\nTheories and the Bott Spiral CLASS:PUBLIC DESCRIPTION:CAMERON KRULEWSKI (PERIMETER INSTITUTE)\n\n_Invertible Field Th eories and the Bott Spiral_\n\nSymmetry-protected topological phases of ma tter (SPTs) admit\ndescriptions in terms of homotopy theory. Freed--Hopkin s defined\n\"free-to-interacting maps\" to model the physical process of c omparing\nfree fermion SPTs (classified by K-theory) with more general\,\n interacting models (classified by certain invertible functorial field\nthe ories). With Debray and Stehouwer\, we generalized this approach to\nstudy the \"Bott spiral\" of SPTs constructed by Queiroz--Khalaf--Stern.\nAfter reviewing the homotopical classification of invertible field\ntheories\, I will discuss our construction and some subtleties that\narise in definin g free-to-interacting maps\, such as compatibility with\ndimensional reduc tion\, continuous versus discrete symmetry types\, and\nthe lack of intera cting Morita invariance.\n\nMC 5417 DTSTAMP:20261102T153852Z END:VEVENT BEGIN:VEVENT UID:6ae8ae8cd59a7 DTSTART;TZID=America/Toronto:20261105T130000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20261105T140000 URL:https://uwaterloo.ca/pure-mathematics/events/student-number-theory-semi nar-julius-frizzell-lehmers SUMMARY:Student Number Theory Seminar | Julius Frizzell | Lehmer's Conjectu re\nand Related Problems CLASS:PUBLIC DESCRIPTION:JULIUS FRIZZELL (UNIVERSITY OF WATERLOO)\n\n_Lehmer's Conjectur e and Related Problems_\n\nThe Mahler measure of a polynomial is the produ ct of the moduli of\nit's roots lying outside the unit disk. Lehmer's conj ecture says that\,\namong polynomials with integer coefficients that are n ot cyclotomic\,\nthere exists a polynomial with minimal Mahler measure. We will discuss\nthe history and original motivation behind Lehmer's problem and the\nknown partial results. We will also look at other problems relat ed to\nMahler measure\, such as questions arising from looking at the divi sors\nof Newman polynomials.\n\nMC 5479 DTSTAMP:20261102T153852Z END:VEVENT BEGIN:VEVENT UID:6ae8ae8cd6c14 DTSTART;TZID=America/Toronto:20261106T133000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20261106T143000 URL:https://uwaterloo.ca/pure-mathematics/events/geometry-and-topology-semi nar-jesse-madnick-morse-index SUMMARY:Geometry and Topology Seminar | Jesse Madnick | The Morse index of\ nquartic minimal hypersurfaces CLASS:PUBLIC DESCRIPTION:JESSE MADNICK (SETON HALL UNIVERSITY)\n\n_The Morse index of qu artic minimal hypersurfaces_\n\nGiven a minimal hypersurface S in a round sphere\, its Morse index is\nthe number of variations that are area-decrea sing to second order. In\npractice\, computing the Morse index of a given minimal hypersurface is\nextremely difficult\, requiring detailed informat ion about the Laplace\nspectrum of S. Indeed\, even for the simplest case in which S is\nhomogeneous\, the Morse index of S is not known in general. \nIn this talk\, we compute the Morse index of two such minimal\nhypersur faces. Moreover\, we observe that their spectra contain both\ninteger eige nvalues as well as (irrational) eigenvalues that are not\nexpressible in r adicals. This is joint work with Gavin Ball (Missouri)\nand Uwe Semmelmann (Stuttgart). \nMC 5403 DTSTAMP:20261102T153852Z END:VEVENT BEGIN:VEVENT UID:6ae8ae8cd7c7c DTSTART;TZID=America/Toronto:20261109T143000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20261109T153000 URL:https://uwaterloo.ca/pure-mathematics/events/pure-math-colloquium-kumar -murty-motives-periods-and SUMMARY:Pure Math Colloquium | Kumar Murty | Motives\, periods and Catalan' s\nconstant CLASS:PUBLIC DESCRIPTION:KUMAR MURTY (UNIVERSITY OF TORONTO)\n\n_Motives\, periods and C atalan's constant_\n\nThere is a fundamental view that the constants that repeatedly arise\nin number theory should either be special values of L-fu nctions\, or\nperiods of algebraic varieties (or more generally\, of motiv es)\, and\nusually both.We will describe this view with examples\, includi ng\nrecent work with Payman Eskandari and Yusuke Nemoto on Catalan's\ncons tant. \nMC 5501 DTSTAMP:20261102T153852Z END:VEVENT BEGIN:VEVENT UID:6ae8ae8cd8aed DTSTART;TZID=America/Toronto:20261029T150000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20261029T160000 URL:https://uwaterloo.ca/pure-mathematics/events/model-theory-seminar-fatem e-peimany-dccm-differential SUMMARY:Model Theory Seminar | Fateme Peimany | DCCM: the differential\nexp ansion of CCM CLASS:PUBLIC DESCRIPTION:FATEME PEIMANY\, UNIVERSITY OF WATERLOO\n\n_DCCM: the different ial expansion of CCM_\n\nWe introduce the theory of compact complex spaces called CCM and\nexpand it to DCCM\, the theory of differentially closed\ nCCM-structures. Finally\, we will explain the good model-theoretic\nprope rties of DCCM and open problems in this theory.\n\nMC 5403 DTSTAMP:20261102T153852Z END:VEVENT BEGIN:VEVENT UID:6ae8ae8cd9a2b DTSTART;TZID=America/Toronto:20261029T130000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20261029T140000 URL:https://uwaterloo.ca/pure-mathematics/events/student-number-theory-semi nar-gian-cordana-sanjaya SUMMARY:Student Number Theory Seminar | Gian Cordana Sanjaya |\nMultiplicat ively dependent integer vectors on a hyperplane CLASS:PUBLIC DESCRIPTION:GIAN CORDANA SANJAYA\, UNIVERSITY OF WATERLOO\n\n_Multiplicativ ely dependent integer vectors on a hyperplane_\n\nIn 2018\, Pappalardi\, S ha\, Shparlinski\, and Stewart counted the number\nof multiplicatively dep endent n-tuples of algebraic integers in a\nfixed number field\, ordered b y pointwise Weil height. Extending this\nwork\, in a joint with with Afifu rrahman and Iverson in 2026\, we count\nthe number of multiplicatively dep endent n-tuples of rational integers\nlying on a hyperplane\, ordered by m aximum absolute value. In this\ntalk\, we will discuss about the multiplic atively dependent tuples\,\nsome motivations behind them\, and how to coun t these tuples\, leading\nto the main results of both papers.\n\nMC 5479 DTSTAMP:20261102T153852Z END:VEVENT BEGIN:VEVENT UID:6ae8ae8cdaa24 DTSTART;TZID=America/Toronto:20261030T093000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20261030T110000 URL:https://uwaterloo.ca/pure-mathematics/events/algebraic-geometry-working -seminar-boris-li-filtered SUMMARY:Algebraic Geometry Working Seminar | Boris Li | Filtered Deformatio ns\nof Trivariate Polynomial Rings CLASS:PUBLIC DESCRIPTION:BORIS LI\, UNIVERSITY OF WATERLOO\n\n_Filtered Deformations of Trivariate Polynomial Rings_\n\nAmong non-commutative rings\, those satisf ying a polynomial identity\n(PI) are especially well-behaved. They share m any properties with\ncommutative rings\, which we understand well. Etingof asked whether\nevery filtered deformation of a finitely generated commuta tive domain\,\nover an algebraically closed field of positive characterist ic\, is PI.\nIn this talk\, we will answer this question of Etingof affirm atively\nfor deformations of polynomial rings in three variables. In the\n pre-seminar\, I will define and discuss the properties of filtered\ndeform ations\n\nMC 5403 DTSTAMP:20261102T153852Z END:VEVENT END:VCALENDAR