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TZNAME:EDT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
DTSTART:20260308T070000
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TZOFFSETFROM:-0400
TZOFFSETTO:-0500
DTSTART:20251102T060000
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BEGIN:VEVENT
UID:6a265b52737df
DTSTART;TZID=America/Toronto:20260611T110000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260611T120000
URL:https://uwaterloo.ca/pure-mathematics/events/algebraic-geometry-seminar
 -15
SUMMARY:Algebraic Geometry Seminar
CLASS:PUBLIC
DESCRIPTION:MATTHEW SATRIANO\, UNIVERSITY OF WATERLOO\n\n_An introduction t
 o toric stacks_\n\nToric stacks are a tractable subclass of stacks due to 
 their\ncombinatorial structure. They can serve as an introduction to stack
 s\nin the same way that toric varieties can be an introduction to\nschemes
 . We will show how one can gain insight into the geometry of\ntoric stacks
  with simple pictures of fans and marked points.\n\nMC 5403
DTSTAMP:20260608T060402Z
END:VEVENT
BEGIN:VEVENT
UID:6a265b5276439
DTSTART;TZID=America/Toronto:20260612T113000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260612T123000
URL:https://uwaterloo.ca/pure-mathematics/events/ergodic-theory-learning-se
 minar-3
SUMMARY:Ergodic Theory Learning Seminar
CLASS:PUBLIC
DESCRIPTION:JULIUS FRIZZELL\, UNIVERSITY OF WATERLOO\n\n_Generic Measures_\
 n\nWe will begin to discuss generic measures and their applications to\ner
 godic theory in proving Roth’s theorem.\n\nMC 5417
DTSTAMP:20260608T060402Z
END:VEVENT
BEGIN:VEVENT
UID:6a265b5276c7a
DTSTART;TZID=America/Toronto:20260611T163000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260611T173000
URL:https://uwaterloo.ca/pure-mathematics/events/quantum-catalyst-seminar
SUMMARY:Quantum Catalyst Seminar
CLASS:PUBLIC
DESCRIPTION:OLIVIER LALONDE\, UNIVERSITY OF WATERLOO\n\n_Quantum chromatic 
 numbers\, orthogonal representations\, and the\nHadamard’conjecture_\n\n
 Cameron\, Montanaro\, Newman\, Severini and Winter gave a construction\nwh
 ich shows that\, for \\(n \\in \\{2\,4\,8\\}\\) any graph _G_ which\na
 dmits a real \\(n\\)-dimensional orthogonal representation\nsatisfies \\(
 \\chi_q(G) \\leq n\\).This result can be recast as the\nstatement that \\
 (\\chi_q(S^{n-1}_\\mathbb{R}) = n\\)  for these values\nof \\(n\\)\, whe
 re \\(S^{n-1}_\\mathbb{F}\\) stands for the orthogonality\ngraph of the 
 unit sphere in \\(\\mathbb{F}^n\\). We investigate possible\nextensions o
 f their construction. We first show that their hypothesis\nthat the orthog
 onal representation be real-valued is required by\nproving that \\(\\chi_
 q(S^{n-1}_\\mathbb{C}) > n\\) for all \\(n \\geq\n3\\). We also exhibit 
 a finite\nsubgraph \\(G_{19}\\) of \\(S^{2}_\\mathbb{C}\\)  and show t
 hat \\(k+4\n= \\chi_q^{(1)}(G_{19} \\vee K_k) > \\xi_{\\mathbb{C}}(G_{19}
  \\vee K_k) =\nk+3\\) for all \\(k\\)\, so that the joins \\(G_{19} \\v
 ee K_k\\) form a\nfamily of finitary witnesses of the aforementioned sepa
 ration for the\nspecial case of rank-one colorings. As a byproduct\, we sh
 ow\nthat \\(\\xi_\\mathbb{R}(G_{19}) = 4\\)\, thereby separating the real
  and\ncomplex orthogonal ranks. For the case of the real sphere\, we show\
 nthat \\(\\chi_q(S^{n-1}_\\mathbb{R}) > n\\) whenever \\(n \\neq\n2\\)
  and \\(n\\) is not a multiple of 4. On the other hand\, we show\nthat
  \\(\\chi_q(S^{n-1}_\\mathbb{R}) = n\\) does does hold whenever a\nHadam
 ard matrix of order \\(n\\) exists. Hence\, assuming the Hadamard\nconjec
 ture\, it follows that the CMNSW construction can be extended to\nreal \\(
 n\\)-dimensional orthogonal representations if and only\nif \\(n=2\\) or
  \\(n\\) is a multiple of 4. Our method of proof\ninvolves showing the e
 quivalence between the existence of such a\nconstruction and the ability t
 o find a maximal code space for\nClifford-algebraic errors given a clean a
 ncilla\, and we believe that\nthe representation-theoretic techniques we u
 se for tackling the latter\nproblem could be of independent interest. It a
 lso follows from this\nequivalence that \\(\\chi^{(1)}_q(S^{n-1}_\\mathbb
 {R}) = n\\) if and\nonly if \\(n \\in \\{2\,4\,8\\}\\)\, thereby settlin
 g a conjecture of Zeng\nand Zhang.\n\nQNC 1201
DTSTAMP:20260608T060402Z
END:VEVENT
BEGIN:VEVENT
UID:6a265b5277602
DTSTART;TZID=America/Toronto:20260612T153000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260612T163000
URL:https://uwaterloo.ca/pure-mathematics/events/geometry-and-topology-semi
 nar-51
SUMMARY:Geometry and Topology Seminar
CLASS:PUBLIC
DESCRIPTION:TOMMASO PACINI\, UNIVERSITY OF TORINO\n\n_Anisotropic calibrati
 ons\, adiabatic limits\, and mirror symmetry_\n\nCalibrations\, adiabatic 
 limits and Fueter maps play an important role\nin the theory of man ifolds
  with special holonomy and in the\ncorresponding gauge theory. The goal of
  this seminar is to show how\nthey can be fitted into a very general frame
 work\, defined via\ndistributions and the concept of “anisotropic calibr
 ations”. This\nframework (i) applies in a uniform way across special hol
 onomy\, (ii)\nprovides an identification between certain Fueter maps and c
 alibrated\nsubmanifolds\, (iii) introduces new degrees of freedom which ma
 y be\nuseful towards genericity arguments\, (iv) provides techniques for b
 oth\nexplicit and abstract existence results for Fueter maps. This is join
 t\nwork with Kotaro Kawai (BIMSA\, China). The seminar will be largely\nno
 n-technical. Details can be found in the arXiv paper with the same\ntitle.
 \n\nMC 5403
DTSTAMP:20260608T060402Z
END:VEVENT
BEGIN:VEVENT
UID:6a265b5277d63
DTSTART;TZID=America/Toronto:20260611T133000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260611T150000
URL:https://uwaterloo.ca/pure-mathematics/events/computability-learning-sem
 inar-172
SUMMARY:Computability Learning Seminar
CLASS:PUBLIC
DESCRIPTION:BEINING MU\, UNIVERSITY OF WATERLOO\n\n_Sacks' Splitting Theore
 m_\n\nIn this talk\, I will present Sacks’ Splitting Theorem\, which sta
 tes\nthat every nonzero computably enumerable degree can be split into the
 \njoin of two strictly lower computably enumerable degrees\, as an\nexampl
 e of finite injury priority argument. I will discuss two\ndifferent proofs
  of the theorem\, one of which is the classical way of\nhow people think a
 bout finite injury arguments\, while the other is a\nmodern way of present
 ing a priority argument where a priority tree is\ninvolved.\n\nMC 5403
DTSTAMP:20260608T060402Z
END:VEVENT
BEGIN:VEVENT
UID:6a265b5278523
DTSTART;TZID=America/Toronto:20260610T140000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260610T170000
URL:https://uwaterloo.ca/pure-mathematics/events/differential-geometry-work
 ing-seminar-192
SUMMARY:Differential Geometry Working Seminar
CLASS:PUBLIC
DESCRIPTION:BENOIT CHARBONNEAU\, UNIVERSITY OF WATERLOO\n\n_Invariant conne
 ctions and Wang’s theorem_\n\nIn this working seminar\, we will study th
 e classification result for\ninvariant connections on principal bundles on
  homogeneous spaces\nproved by Hsien-Chung Wang in 1958 and learn\, to par
 aphrase Gonçalo\nOliveira\, some useful facts on invariant connections.\n
 \nMC 4058
DTSTAMP:20260608T060402Z
END:VEVENT
BEGIN:VEVENT
UID:6a265b5278d63
DTSTART;TZID=America/Toronto:20260615T143000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260615T153000
URL:https://uwaterloo.ca/pure-mathematics/events/pure-math-colloquium-67
SUMMARY:Pure Math Colloquium
CLASS:PUBLIC
DESCRIPTION:MORITZ WEBER\, Saarland University\n\n_Quantum Mathematics\, qu
 antum symmetries and quantum information_\n\nSince the early days of the f
 oundation of quantum mechanics\, 100 years\nago\, it was clear that a new 
 kind of mathematics was needed in order\nto capture the new physics. At th
 at time\, John von Neumann formulated\nhis principles of quantum mechanics
  and one of the main features was\nnoncommutativity - the fact\, that two 
 observables A and B need not to\ncommute. This was the starting point of a
  systematic study of\nnoncommuting operators which quickly emancipated fro
 m \"just a physics\ntool\" to an own branch in mathematics as such. More a
 nd more often\, it\nis called quantum mathematics nowadays and it comprise
 s C*-algebras\n(aka quantum\ntopology)\, von Neumann algebras (aka quantum
  measure theory)\,\nConnes’s noncommutative geometry (aka quantum differ
 ential\ngeometry)\, quantum groups and many more. I will give a brief surv
 ey on\nquantum mathematics\, and I will then focus on an introduction to\n
 quantum symmetries and their link to quantum information theory.\n\nMC 550
 1
DTSTAMP:20260608T060402Z
END:VEVENT
BEGIN:VEVENT
UID:6a265b527951d
DTSTART;TZID=America/Toronto:20260603T153000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260603T163000
URL:https://uwaterloo.ca/pure-mathematics/events/geometry-and-topology-semi
 nar-50
SUMMARY:Geometry and Topology Seminar
CLASS:PUBLIC
DESCRIPTION:RAGINI SINGHAL\, UNIVERSITY OF MÜNSTER\n\n_Solutions and sing
 ularities of the Ricci-harmonic flow and Ricci-like\nflows of G2-structure
 s_\n\nWe find explicit solutions and singularities of the Ricci-harmonic\n
 flow of $G_2$-structures on 7-dimensionalcontact Calabi-Yau manifolds\nand
  the 7-dimensional Heisenberg group. We prove that the natural\nco-closed$
 G_2$-structure on a contact Calabi-Yau manifold as the\ninitial condition 
 leads to an ancient solution of the Ricci-harmonic\nflow with a finite tim
 e Type I singularity. These are the first\nexamples of Type I singularitie
 s of the Ricci-harmonic flow. We also\nobtain similar (but different) resu
 lts for the Ricci-like flows of\n$G_2$-structures studied by Gianniotis--Z
 acharopoulos in\narXiv:2505.06872 (J. Geom. Anal. 36.2 (2026)) and of the 
 negative\ngradient flow of an energy functional of $G_2$-structures studie
 d by\nWeiss--Witt. The talk is based on a joint work with Shubham Dwivedi\
 n(Hamburg).\n\nMC 5417
DTSTAMP:20260608T060402Z
END:VEVENT
BEGIN:VEVENT
UID:6a265b5279c59
DTSTART;TZID=America/Toronto:20260603T140000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260603T150000
URL:https://uwaterloo.ca/pure-mathematics/events/geometry-and-topology-semi
 nar-49
SUMMARY:Geometry and Topology Seminar
CLASS:PUBLIC
DESCRIPTION:IZAR ALONSO\, RUTGERS UNIVERSITY\n\n_Gauge Theory on hyperkähl
 er manifolds_\n\n$H$-instantons are a distinguished type of connections on
  Riemannian\n$n$-manifolds\, as they are generalizations of anti-self-dual
 \nconnections to manifolds of dimensions greater than 4. Examples of\n$H$-
 instantons include primitive Hermitian Yang--Mills (pHYM)\nconnections\, $
 \\mathrm{Spin}(7)$-instantons\,which have been of great\ninterest in the r
 ecent years\, and the less studied\n$\\mathrm{Sp}(n)$-instantons. In this 
 talk\, I will describe\n$\\mathrm{Sp}(2)$-instantons on hyperk\\\"ahler $8
 $-manifolds and their\nrelations with other gauge-theoretical objects. I w
 ill then describe\nthe construction of examples of $\\mathrm{Sp}(2)$-insta
 ntons\,pHYM\nconnections\, and $\\mathrm{Spin}(7)$-instantons with symmetr
 y on the\nmanifold $T^* \\mathbb{CP}^2$with the Calabi hyperk\\\"ahler str
 ucture.\nThis talk is based on arXiv:2508.17119.\n\nMC 5417
DTSTAMP:20260608T060402Z
END:VEVENT
BEGIN:VEVENT
UID:6a265b527a378
DTSTART;TZID=America/Toronto:20260605T113000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260605T123000
URL:https://uwaterloo.ca/pure-mathematics/events/ergodic-theory-learning-se
 minar-2
SUMMARY:Ergodic Theory Learning Seminar
CLASS:PUBLIC
DESCRIPTION:JULIUS FRIZZELL\, UNIVERSITY OF WATERLOO\n\n_Mutliple recurrenc
 e for weakly-mixing transformations (Part II)_\n\nWe will continue to disc
 uss weakly-mixing transformations and work\ntowards proving a special case
  of the multiple recurrence theorem.\n\nMC 5417
DTSTAMP:20260608T060402Z
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