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DTSTART:20260308T070000
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TZOFFSETFROM:-0400
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DTSTART:20251102T060000
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BEGIN:VEVENT
UID:6a6ceb74a49fa
DTSTART;TZID=America/Toronto:20260805T153000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260805T170000
URL:https://uwaterloo.ca/pure-mathematics/events/differential-geometry-work
 ing-seminar-alex-pawelko-wild
SUMMARY:Differential Geometry Working Seminar | Alex Pawelko | Wild\nSpecul
 ation about Homotopy Invariants of G_2 Structures
CLASS:PUBLIC
DESCRIPTION:ALEX PAWELKO (UNIVERSITY OF WATERLOO)\n\n_Wild Speculation abou
 t Homotopy Invariants of  G_2 Structures_ \nIn pursuit of a setting wher
 e one could phrase a G_2 Calabi\nconjecture\, we will try to understand a 
 certain homotopy-theoretic\nspace with which one can make sense of S7-valu
 ed cohomology. \nMC 5417
DTSTAMP:20260731T183740Z
END:VEVENT
BEGIN:VEVENT
UID:6a6ceb74a8b41
DTSTART;TZID=America/Toronto:20260805T140000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260805T153000
URL:https://uwaterloo.ca/pure-mathematics/events/differential-geometry-work
 ing-seminar-spiro-karigiannis
SUMMARY:Differential Geometry Working Seminar | Spiro Karigiannis |\nDecomp
 osition of Riemann curvature in 4 dimensions (and beyond?)
CLASS:PUBLIC
DESCRIPTION:SPIRO KARIGIANNIS (UNIVERSITY OF WATERLOO)\n\n_Decomposition of
  Riemann curvature in 4 dimensions (and beyond?)_\n\nThis is a continuatio
 n of my earlier talk from May. We showed that the\nRiemann curvature tenso
 r of a Riemannian metric decomposes into three\northogonal components: the
  scalar curvature\, the traceless Ricci\ncurvature tensor\, and the Weyl c
 urvature tensor. We will see that in\ndimension 4 we can say more. The Wey
 l curvature decomposes into two\npieces\, and we will explicitly determine
  the decomposition the\ncurvature operator (as a self-adjoint operator on 
 2-forms). As an\napplication\, we will discuss the Singer-Thorpe Theorem c
 haracterizing\n4-dimensional Einstein metrics in terms of this decompositi
 on. If time\npermits\, we will briefly discuss a generalization of these i
 deas to\nG2-geometry in seven dimensions.\n\nMC 5417
DTSTAMP:20260731T183740Z
END:VEVENT
BEGIN:VEVENT
UID:6a6ceb74a9a7b
DTSTART;TZID=America/Toronto:20260729T153000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260729T170000
URL:https://uwaterloo.ca/pure-mathematics/events/differential-geometry-work
 ing-seminar-faisal-romshoo-torsion
SUMMARY:Differential Geometry Working Seminar | Faisal Romshoo | Torsion-fr
 ee\nhypersymplectic structures
CLASS:PUBLIC
DESCRIPTION:FAISAL ROMSHOO (UNIVERSITY OF WATERLOO)\n\n_Torsion-free hypers
 ymplectic structures_\n\nWe know that a torsion-free \\(\\mathrm{G}_2-\\)s
 tructure determines a\nRiemannian metric with holotomy contained in \\(\\m
 athrm{G}_2\\).\nHowever\, a torsion-free hypersymplectic structure in dime
 nsion \\($4$\\)\nis not necessarily a hyperkähler structure. We will look
  at a\ncounterexample and see under what conditions does a torsion-free\nh
 ypersymplectic structure determine a hyperkähler structure.\n\nMC 5417
DTSTAMP:20260731T183740Z
END:VEVENT
BEGIN:VEVENT
UID:6a6ceb74aa9bf
DTSTART;TZID=America/Toronto:20260729T140000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260729T153000
URL:https://uwaterloo.ca/pure-mathematics/events/differential-geometry-work
 ing-seminar-viktor-majewski
SUMMARY:Differential Geometry Working Seminar | Viktor Majewski |\nDegenera
 tions of exotic Calabi-Yau metrics through Atiyahs flop
CLASS:PUBLIC
DESCRIPTION:VIKTOR MAJEWSKI (UNIVERSITY OF WATERLOO)\n\n_Degenerations of e
 xotic Calabi-Yau metrics through Atiyahs flop_\n\nThe small resolution of 
 the three-dimensional ordinary double point\ncarries the classical Candela
 s–de la Ossafamily of asymptotically\nconical Calabi–Yau metrics. In t
 his talk\, I will describe the\nconstruction of a new one-parameter family
  of complete Calabi–Yau\nmetrics on the same complex manifold. The const
 ruction begins withan\nexplicit family of U(2)-invariant Kähler metrics a
 dapted to the\ngeometry of the exceptional curve and theasymptotic conical
  end. After\nestablishing uniform Sobolev\, curvature\, and volume-growth 
 estimates\,\none solvesthe noncompact complex Monge–Ampère equation to 
 obtain\nRicci-flat metrics in the corresponding Kählerclasses. A central\
 nissue is to understand the behaviour of this family as the area of the\ne
 xceptional curve tends tozero. I will explain how a combination of\nweight
 ed pluripotential estimates\, Chern–Lu inequalities\,\nsymmetry\,and ana
 lysis on the conifold yields uniform control away from\nthe exceptional se
 t and produces a singularCalabi–Yau metric on the\nconifold. The resulti
 ng degeneration has a different local geometric\nprofile from theclassical
  Candelas–de la Ossa degeneration\,\nproviding an exotic family of Calab
 i–Yau metrics on the\nresolvedconifold\n\nMC 5417
DTSTAMP:20260731T183740Z
END:VEVENT
BEGIN:VEVENT
UID:6a6ceb74ab93c
DTSTART;TZID=America/Toronto:20260731T093000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260731T123000
URL:https://uwaterloo.ca/pure-mathematics/events/phd-thesis-defense-erik-se
 guin-ulam-stability-quantum-groups
SUMMARY:PhD Thesis Defense | Erik Séguin | Ulam Stability for Quantum Grou
 ps\nand Noncommutative Dynamics
CLASS:PUBLIC
DESCRIPTION:ERIK SÉGUIN\, UNIVERSITY OF WATERLOO\n\n_Ulam Stability for Qu
 antum Groups and Noncommutative Dynamics_\n\nIn this talk\, we discuss var
 ious \"noncommutative\" extensions of\nclassical commutative phenomena. We
  focus on two particular cases of\nthis: representation stability for loca
 lly compact quantum groups\n(extending representation stability for classi
 cal locally compact\ngroups) and minimality for C*-dynamical systems (exte
 nding minimality\nfor topological flows). In the first part of the talk\, 
 we discuss the\nquestion of Ulam stability for approximate representations
  of locally\ncompact quantum groups. We show that compact quantum groups a
 nd\namenable discrete quantum groups are representation stable. In the\npr
 ocess\, we establish a partial stability result for general amenable\nloca
 lly compact quantum groups\, showing that if one imposes additional\nconst
 raints on the approximate representation in question then the\nassumption 
 of compactness or discreteness can be dispensed with. In\nthe second part 
 of the talk\, we discuss the notion of minimality for\nC*-dynamical system
 s. We show that the accepted definition is somewhat\nunsatisfactory as an 
 extension of its commutative counterpart from\nboth a topological dynamica
 l and an operator algebraic perspective and\npresent an alternative notion
  of an extension which rectifies these\nissues. We demonstrate that this a
 lternate notion also encodes\noperator algebraic structure which does not 
 appear to have a direct\ndynamical connection\, further motivating its stu
 dy. We outline various\ncharacterizations and extension properties for thi
 s notion and discuss\nits consequences.\n\nMC 2009
DTSTAMP:20260731T183740Z
END:VEVENT
BEGIN:VEVENT
UID:6a6ceb74ac831
DTSTART;TZID=America/Toronto:20260730T133000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260730T150000
URL:https://uwaterloo.ca/pure-mathematics/events/computability-learning-sem
 inar-joey-lakerdas-gayle-high
SUMMARY:Computability Learning Seminar | Joey Lakerdas-Gayle | High incompl
 ete\nc.e. set
CLASS:PUBLIC
DESCRIPTION:JOEY LAKERDAS-GAYLE\, UNIVERSITY OF WATERLOO\n\n_High incomplet
 e c.e. set_\n\nWe use an infinite injury priority tree construction to pro
 ve Sacks'\ntheorem that there exists a high incomplete c.e. set.\n\nMC 540
 3
DTSTAMP:20260731T183740Z
END:VEVENT
BEGIN:VEVENT
UID:6a6ceb74ad56e
DTSTART;TZID=America/Toronto:20260724T113000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260724T123000
URL:https://uwaterloo.ca/pure-mathematics/events/ergodic-theory-learning-se
 minar-julius-frizzell-examples
SUMMARY:Ergodic Theory Learning Seminar | Julius Frizzell | Examples of\nFa
 ctors and Conditional expectation
CLASS:PUBLIC
DESCRIPTION:JULIUS FRIZZELL\, UNIVERSITY OF WATERLOO\n\n_Examples of Factor
 s and Conditional expectation_\n\nWe will discuss examples of factors of m
 easure preserving systems\narising from products and skew-products. We wil
 l also briefly define\nregular and separable extensions. We will then intr
 oduce the concept\nof Conditional expectation and prove some of its basic 
 properties.\n\nMC 5417
DTSTAMP:20260731T183740Z
END:VEVENT
BEGIN:VEVENT
UID:6a6ceb74ae29d
DTSTART;TZID=America/Toronto:20260722T153000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260722T170000
URL:https://uwaterloo.ca/pure-mathematics/events/differential-geometry-work
 ing-seminar-benoit-charbonneau
SUMMARY:Differential Geometry Working Seminar | Benoit Charbonneau | The Di
 rac\noperator on homogeneous manifolds
CLASS:PUBLIC
DESCRIPTION:BENOIT CHARBONNEAU\, UNIVERSITY OF WATERLOO\n\n_The Dirac opera
 tor on homogeneous manifolds_\n\nMC 5417
DTSTAMP:20260731T183740Z
END:VEVENT
BEGIN:VEVENT
UID:6a6ceb74aef8b
DTSTART;TZID=America/Toronto:20260723T133000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260723T150000
URL:https://uwaterloo.ca/pure-mathematics/events/computability-learning-sem
 inar-joey-lakerdas-gayle-dominant
SUMMARY:Computability Learning Seminar | Joey Lakerdas-Gayle | Dominant\nfu
 nctions and high sets
CLASS:PUBLIC
DESCRIPTION:JOEY LAKERDAS-GAYLE\, UNIVERSITY OF WATERLOO\n\n_Dominant funct
 ions and high sets_\n\nWe prove Martin's theorem that \\(A'\\geq_T\\empty
 set''\\) if and only if\n$A$ computes a function that bounds every total c
 omputable function\nalmost everywhere. Then we will begin discussing the i
 nfinite injury\npriority tree construction of Sacks' theorem that there ex
 ists a high\nincomplete c.e. set.\n\nMC 5403
DTSTAMP:20260731T183740Z
END:VEVENT
BEGIN:VEVENT
UID:6a6ceb74afc36
DTSTART;TZID=America/Toronto:20260722T140000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260722T153000
URL:https://uwaterloo.ca/pure-mathematics/events/differential-geometry-work
 ing-seminar-facundo-camano
SUMMARY:Differential Geometry Working Seminar | Facundo Camano | Classifyin
 g\nALF Gravitational Instantons of Cyclic Type
CLASS:PUBLIC
DESCRIPTION:FACUNDO CAMANO\, UNIVERSITY OF WATERLOO\n\n_Classifying ALF Gra
 vitational Instantons of Cyclic Type_\n\nI will go over the paper ”Rigid
 ity for Multi-Taub-NUT Metrics” by\nVincent Minerbe.\n\nMC 5417
DTSTAMP:20260731T183740Z
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