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:69d7f0d934367 DTSTART;TZID=America/Toronto:20260413T130000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260413T143000 URL:https://uwaterloo.ca/pure-mathematics/events/computability-learning-sem inarr SUMMARY:Computability Learning Seminarr CLASS:PUBLIC DESCRIPTION:JOEY LAKERDAS-GAYLE\, UNIVERSITY OF WATERLOO\n\n_K-triviality_\ n\nWe will introduce K-trivial sets following Chapter 11 of Downey &\nHirs chfeldt. We will prove some basic factssuch as the\nSolovay-Zambella Theor em that there exist noncomputable K-trivial c.e.\nsets.\n\nMC 5403 DTSTAMP:20260409T183257Z END:VEVENT BEGIN:VEVENT UID:69d7f0d9358a1 DTSTART;TZID=America/Toronto:20260407T100000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260407T110000 URL:https://uwaterloo.ca/pure-mathematics/events/number-theory-seminar-165 SUMMARY:Number Theory Seminar CLASS:PUBLIC DESCRIPTION:ILA VARMA\, UNIVERSITY OF TORONTO\n\n_Counting Number Fields by P^1 height_\n\nWhen do two irreducible polynomials with integer coefficie nts define\nthe same number field? One can define an action of GL_2 × GL_ 1 on the\nspace of polynomials of degree n so that for any two polynomials f and\ng in the same orbit\, the roots of f may be expressed as rational\ nlinear transformations of the roots of g\; thus\, they generate the same\ nfield. In this article\, we show that almost all polynomials of degree\nn with size at most X can only define the same number field as another\npol ynomial of degree n with size at most X if they lie in the same\norbit for this group action. (Here we measure the size of polynomials\nby the great est absolute value of their coefficients.)\n\nThis improves on work of Bha rgava\, Shankar\, and Wang\, who proved a\nsimilar statement for a positiv e proportion of polynomials. Using this\nresult\, we prove that the number of degree n fields such that the\nsmallest polynomial defining the field has size at most X is\nasymptotic to a constant times X^{n+1} as long as n \\ge 3. For n = 2\,\nwe obtain a precise asymptotic of the form 27/(pi^2) * X^2\n\nThis is joint work with Arango-Pineros\, Gundlach\, Lemke Olive r\,\nMcGown\, Sawin\, Serrano Lopez\, and Shankar.\n\nMC 5479 DTSTAMP:20260409T183257Z END:VEVENT BEGIN:VEVENT UID:69d7f0d936053 DTSTART;TZID=America/Toronto:20260413T143000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260413T153000 URL:https://uwaterloo.ca/pure-mathematics/events/pure-math-colloquium-66 SUMMARY:Pure Math Colloquium CLASS:PUBLIC DESCRIPTION:HENRIQUE SÀ EARP\, UNICAMP\n\n_Updates on flows of geometric s tructures_\n\nAiming at a public with interests among Riemannian and compl ex\ngeometry\, Lie groups and parabolic PDEs\, Iwill recall some results\n towards a general analytical theory for flows of H-structures\,\nobtained with Fadel\,Loubeau and Moreno. Then\, as a concrete example\, I\nwill pre sent some recent progress on SU(2)-flows on 4-manifolds\,\ninitiating a cl assification programme of ‘parabolic’ flows\, based\non a representati on-theoretic methodoriginally due to Bryant in the\ncontext of G2 geometry \, obtained with Fowdar.\n\nMC 5501 DTSTAMP:20260409T183257Z END:VEVENT BEGIN:VEVENT UID:69d7f0d936745 DTSTART;TZID=America/Toronto:20260408T153000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260408T163000 URL:https://uwaterloo.ca/pure-mathematics/events/waterloo-mcmaster-joint-lo gic-seminar-0 SUMMARY:Waterloo-McMaster Joint Logic Seminar CLASS:PUBLIC DESCRIPTION:FATEME PEIMANY\, UNIVERSITY OF WATERLOO\n\n_Definable Groups in Differentially Closed CCM-structures (DCCM)_\n\nHow do definable groups b ehave when a compact complex manifold is\nequipped with a generic derivati on? Inthis talk\, I will discuss an\nongoing project to understand definab le groups within the theory of\nDifferentiallyClosed CCM-structures (DCCM) . The presentation centers\non a foundational model-theoretic analogy: jus t asadding a derivation\nto algebraic geometry bridges ACF and DCF\, a par allel expansion maps\nCCM to DCCM inthe analytic setting. By reviewing est ablished results\nfor definable groups in ACF\, DCF\, and CCM\, we willexp lore how these\nclassifications translate into the differential-analytic f ramework of\nDCCM.\n\nMC 5417 DTSTAMP:20260409T183257Z END:VEVENT BEGIN:VEVENT UID:69d7f0d936df6 DTSTART;TZID=America/Toronto:20260407T160000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260407T170000 URL:https://uwaterloo.ca/pure-mathematics/events/model-theory-working-semin ar-44 SUMMARY:Model Theory Working Seminar CLASS:PUBLIC DESCRIPTION:JULES RIBOLZI\, UNIVERSITY OF WATERLOO\n\n_A Chevalley structur e theorem for meromorphic groups_\n\nWe continue to study definable groups in the standard model of CCM. We\nwill look at the proof of a Chevalleyst ructure type theorem for\nmeromorphic groups (that is\, meromorphic groups are regular in the\nsense of Fujiki)from the article of Pillay and Scanlo n.\n\nMC 5479 DTSTAMP:20260409T183257Z END:VEVENT BEGIN:VEVENT UID:69d7f0d93749b DTSTART;TZID=America/Toronto:20260406T143000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260406T153000 URL:https://uwaterloo.ca/pure-mathematics/events/pure-math-colloquium-65 SUMMARY:Pure Math Colloquium CLASS:PUBLIC DESCRIPTION:HONG WANG\, NYU COURANT\n\n_Kakeya sets in R^3_\n\nA Kakeya set is a compact subset of R^n that contains a unit line\nsegment point ing in every direction.  Kakeya set conjecture asserts\nthat every Kak eya set has Minkowski and  Hausdorff dimension n. We\nprove this conject ure in R^3 as a consequence of a more general\nstatement about union of tubes. This is joint work with Josh Zahl.\n\nM3 1006 DTSTAMP:20260409T183257Z END:VEVENT BEGIN:VEVENT UID:69d7f0d937db2 DTSTART;TZID=America/Toronto:20260407T170000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260407T173000 URL:https://uwaterloo.ca/pure-mathematics/events/pure-math-grad-colloquium- 21 SUMMARY:Pure Math Grad Colloquium CLASS:PUBLIC DESCRIPTION:JULIUS FRIZZELL\, UNIVERSITY OF WATERLOO\n\n_The Bernoulli Disc repancy_\n\nThe Bernoulli numbers were originally defined by Jacob Bernoul li with\nthe goal of finding a general formula tocompute the sum of the fi rst n\nconsecutive m-th powers. In modern math\, they have many different\ napplications\,most notably in analytic number theory\, where they are\nus ed to analytically continue the Riemann Zeta functionvia\nEuler-Maclaurin summation. However\, modern mathematicians use a\nslightly different defin ition to the oneoriginally given by Bernoulli\n(which differs in only one term). In this talk\, we will discuss the\ndifferencesbetween the two defi nitions\, looking at just some of the\nmany examples given by Peter Luschn y in his ”BernoulliManifesto”.\n\nMC 5501\n\n(Refreshments will start at 4:30) DTSTAMP:20260409T183257Z END:VEVENT BEGIN:VEVENT UID:69d7f0d93876c DTSTART;TZID=America/Toronto:20260402T143000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260402T154500 URL:https://uwaterloo.ca/pure-mathematics/events/differential-geometry-work ing-seminar-183 SUMMARY:Differential Geometry Working Seminar CLASS:PUBLIC DESCRIPTION:FAISAL ROMSHOO\, UNIVERSITY OF WATERLOO\n\n_Deformations of cal ibrations\, II_\n\nWe will continue where we left off last time\, completi ng the proof of\nwhen the obstructions for the calibrationsvanish. If time permits\, we\nwill go through the proof of the fact that if an orbit is m etrical\,\nelliptic andtopological\, then the corresponding moduli space i s a\nsmooth manifold.\n\nMC 5403 DTSTAMP:20260409T183257Z END:VEVENT BEGIN:VEVENT UID:69d7f0d938e7a DTSTART;TZID=America/Toronto:20260407T100000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260407T130000 URL:https://uwaterloo.ca/pure-mathematics/events/phd-thesis-defense-15 SUMMARY:PhD Thesis Defense CLASS:PUBLIC DESCRIPTION:XIAO ZHONG\, UNIVERSITY OF WATERLOO\n\n_Topics in Arithmetic Dy namics_\n\nThis thesis studies several problems in arithmetic dynamics\, f ocusing\non preimages of invariant subvarieties\,common zeros of iterates of\nrational functions\, and periodic curves for polynomial endomorphisms. \nWeinvestigate stabilization phenomena for rational points in backward\no rbits and develop dynamical cancellationresults for semigroups of\npolynom ials. We also prove a finiteness theorem for common zeros of\niterates ofc ompositionally independent rational functions\, answering a\nquestion of H sia and Tucker. Finally\, we studypolynomial endomorphisms\nof the project ive plane with many periodic curves\, showing that\nfamilies containinga Z ariski dense set of periodic curves must be\ninvariant under an iterate\, and we classify maps admittinginfinitely\nmany periodic curves of bounded degree.\n\nMC 5479 DTSTAMP:20260409T183257Z END:VEVENT BEGIN:VEVENT UID:69d7f0d9395e5 DTSTART;TZID=America/Toronto:20260331T160000 SEQUENCE:0 TRANSP:TRANSPARENT DTEND;TZID=America/Toronto:20260331T170000 URL:https://uwaterloo.ca/pure-mathematics/events/model-theory-working-semin ar-43 SUMMARY:Model Theory Working Seminar CLASS:PUBLIC DESCRIPTION:FATEME PEIMANY\, UNIVERSITY OF WATERLOO\n\n_Model Theory Workin g Seminar_\n\nWe continue to study the structure of groups definable in CC M.\n\nMC 5479 DTSTAMP:20260409T183257Z END:VEVENT END:VCALENDAR