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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:6a6d845b59bad
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:20260801T053003Z
END:VEVENT
BEGIN:VEVENT
UID:6a6d845b5ac73
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:20260801T053003Z
END:VEVENT
BEGIN:VEVENT
UID:6a6d845b5b7b2
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:20260801T053003Z
END:VEVENT
BEGIN:VEVENT
UID:6a6d845b5c3dd
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:20260801T053003Z
END:VEVENT
BEGIN:VEVENT
UID:6a6d845b5cef4
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:20260801T053003Z
END:VEVENT
BEGIN:VEVENT
UID:6a6d845b5da0d
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:20260801T053003Z
END:VEVENT
BEGIN:VEVENT
UID:6a6d845b5e556
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:20260801T053003Z
END:VEVENT
BEGIN:VEVENT
UID:6a6d845b5efab
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:20260801T053003Z
END:VEVENT
BEGIN:VEVENT
UID:6a6d845b5fa98
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:20260801T053003Z
END:VEVENT
BEGIN:VEVENT
UID:6a6d845b60566
DTSTART;TZID=America/Toronto:20260715T153000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260715T170000
URL:https://uwaterloo.ca/pure-mathematics/events/differential-geometry-work
 ing-seminar-alexander-teeter
SUMMARY:Differential Geometry Working Seminar | Alexander Teeter |\nFreedma
 n’s Results and Donaldson’s Exclusions: Classification of\n4-manifolds
  by intersection forms
CLASS:PUBLIC
DESCRIPTION:ALEXANDER TEETER\, UNIVERSITY OF WATERLOO\n\n_Freedman’s Resu
 lts and Donaldson’s Exclusions: Classification of\n4-manifolds by inters
 ection forms_\n\nWe look at Serre's algebraic classification of symmetric 
 integral\nunimodular forms\, and then Freedman's topological classificatio
 n of\ntopological 4-manifolds by their intersection forms. After\, we take
  a\nturn to looking at Donaldson's exclusions\, finding that smooth\n4-man
 ifolds are not as well behaved. Time permitting\, we will see how\nDonalds
 on's exclusions naturally lead to the existence of exotic\n\\(\\mathbb{R}^
 4\\)s.\n\nMC 5417
DTSTAMP:20260801T053003Z
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