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DTSTART;TZID=America/Toronto:20250521T130000
SEQUENCE:0
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URL:/pure-mathematics/events/student-number-theory-semi
 nar-80
SUMMARY:Student Number Theory Seminar
CLASS:PUBLIC
DESCRIPTION:Summary \n\nAJ FONG\, UNIVERSITY OF WATERLOO\n\nThe Markov equa
 tion and birational geometry\n\nWe will briefly talk about the basics on t
 he Markov equation and its\nsolutions\, and producing Hirzebruch--Jung con
 tinued fractions from\ntheir weights. We will also describe some connectio
 ns to certain\ndegenerations of the complex projective plane. This talk is
  based on\nwork of Urzúa and Zúñiga. \n\nMC 5417\n 
DTSTAMP:20250516T073810Z
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BEGIN:VEVENT
UID:6826eb620acf1
DTSTART;TZID=America/Toronto:20250523T170000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20250523T180000
URL:/pure-mathematics/events/graduate-student-colloquiu
 m-23
SUMMARY:Graduate Student Colloquium
CLASS:PUBLIC
DESCRIPTION:Summary \n\nFRANCISCO VILLACIS\, UNIVERSITY OF WATERLOO\n\nA De
 ep Dive into Mathematicians’ Questionable Outfits\n\nBeing able to prove
  the most impressive theorems and having a good\nsense of fashion need not
  be mutually exclusive - except it might be?\nThis will be up to you to ju
 dge in this talk. Together\, we’ll apply\nthe most unscientific of metho
 dologies to create a tier list of\nmathematicians based solely on their dr
 essing style - from Euclid’s\ntimeless toga to Grothendieck’s \"I’ve
  been living in a forest for\nfive years\" aesthetic. Be sure to bring you
 r best outfits\, otherwise\nyou might end up in a bored grad student's tie
 r list one day.\n\nMC 5479\n\n(snacks from 4:00pm)\n 
DTSTAMP:20250516T073810Z
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BEGIN:VEVENT
UID:6826eb620b55e
DTSTART;TZID=America/Toronto:20250522T143000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20250522T154500
URL:/pure-mathematics/events/differential-geometry-work
 ing-seminar-143
SUMMARY:Differential Geometry Working Seminar
CLASS:PUBLIC
DESCRIPTION:Summary \n\nALEX PAWELKO\, UNIVERSITY OF WATERLOO\n\nThe Formal
  Kaehler Structure of the G2 Knot Space\n\nWe will explore the usual suspe
 cts of the moduli space of knots\nembeddable in a G2 manifold\, based upon
  the work of Brylinski for the\nanalogous space corresponding to the 3-dim
 ensional cross product. This\ngives an infinite-dimensional \"formally Kae
 hler\" manifold\, which one\ncan consider Kaehler reduction on. If time pe
 rmits\, we will gesture\nvaguely at considerations from gauge theory and g
 eometric quantization\nthat motivate many interesting questions in the cas
 e of G2 manifolds.\n\nMC 5403\n 
DTSTAMP:20250516T073810Z
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BEGIN:VEVENT
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DTSTART;TZID=America/Toronto:20250522T130000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20250522T141500
URL:/pure-mathematics/events/differential-geometry-work
 ing-seminar-142
SUMMARY:Differential Geometry Working Seminar
CLASS:PUBLIC
DESCRIPTION:Summary \n\nFAISAL ROMSHOO\, UNIVERSITY OF WATERLOO\n\nSymmetry
  groups\, moment maps and cohomogeneity one special Lagrangians\nin C^m\n
 \nWe will discuss the relationship between symmetries and moment maps as\n
 explained in arXiv:math/0008021 and how this allows us to construct\ncohom
 ogeneity one special Lagrangians in C^m. Time permitting\, we will\ndiscus
 s some examples of SL m-folds in C^m.\n\nMC 5403\n 
DTSTAMP:20250516T073810Z
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BEGIN:VEVENT
UID:6826eb620c600
DTSTART;TZID=America/Toronto:20250515T143000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20250515T154500
URL:/pure-mathematics/events/differential-geometry-work
 ing-seminar-141
SUMMARY:Differential Geometry Working Seminar
CLASS:PUBLIC
DESCRIPTION:Summary \n\nFACUNDO CAMANO\, UNIVERSITY OF WATERLOO\n\nConverge
 nce Results for Taub-NUT and Eguchi-Hanson spaces\n\nWe define multi-Taub-
 NUT and multi-Eguchi-Hanson spaces and look at\nGromov-Hausdorff convergen
 ces involving these spaces.\n\nMC 5403\n 
DTSTAMP:20250516T073810Z
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BEGIN:VEVENT
UID:6826eb620cc0d
DTSTART;TZID=America/Toronto:20250515T130000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20250515T141500
URL:/pure-mathematics/events/differential-geometry-work
 ing-seminar-140
SUMMARY:Differential Geometry Working Seminar
CLASS:PUBLIC
DESCRIPTION:Summary \n\nJUSTIN FUS\, UNIVERSITY OF WATERLOO\n\nThe KKS Form
  and Symplectic Geometry of Coadjoint Orbits\n\nA compact Lie group acts o
 n its Lie algebra dual via the coadjoint\nrepresentation. In this talk\, w
 e will explore how the coadjoint orbits\nof this representation carry a na
 tural symplectic structure called the\nKirillov-Kostant-Souriau (KKS) form
 . The KKS form is preserved by the\naction. If time permits\, we will show
  that there is a moment map for\nthe action that coincides with the inclus
 ion map of the orbit. A\nworked example for SU(2) will be performed.\n\nMC
  5403\n 
DTSTAMP:20250516T073810Z
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BEGIN:VEVENT
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DTSTART;TZID=America/Toronto:20250520T140000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20250520T153000
URL:/pure-mathematics/events/computability-learning-sem
 inar-146
SUMMARY:Computability Learning Seminar
CLASS:PUBLIC
DESCRIPTION:Summary \n\nJOEY LAKERDAS-GAYLE\, UNIVERSITY OF WATERLOO\n\nEff
 ective Algebra 1\n\nWe will begin learning about recursive groups followin
 g Chapter 8 of\nYuri Manin's \"A Course in Mathematical Logic for Mathemat
 icians\".\n\nMC 5417\n 
DTSTAMP:20250516T073810Z
END:VEVENT
BEGIN:VEVENT
UID:6826eb620d85f
DTSTART;TZID=America/Toronto:20250516T110000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20250516T120000
URL:/pure-mathematics/events/algebraic-geometry-working
 -seminar-93
SUMMARY:Algebraic geometry working seminar
CLASS:PUBLIC
DESCRIPTION:Summary \n\nJIAHUI HUANG\, UNIVERSITY OF WATERLOO\n\nMotivic in
 tegration for schemes\, DM stacks\, and Artin stacks.\n\nWe give an overvi
 ew of motivic integration and its generalization to\nstacks. Early motivat
 ions for motivic integration involve singularity\ntheory and the monodromy
  conjecture. We will explain how the change of\nvariable formula works\, a
 nd how it generalizes to the stack case.\nMotivic integration for stacks w
 ill use twisted or warped arcs\, and we\nshall give a summary of the const
 ruction of the twisted arc space for\nDM stacks.\n\nMC 5403\n 
DTSTAMP:20250516T073810Z
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BEGIN:VEVENT
UID:6826eb620de7b
DTSTART;TZID=America/Toronto:20250514T130000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20250514T140000
URL:/pure-mathematics/events/student-number-theory-semi
 nar-79
SUMMARY:Student Number Theory Seminar
CLASS:PUBLIC
DESCRIPTION:Summary \n\nZHENCHAO GE\, UNIVERSITY OF WATERLOO\n\nAn additive
  property for product sets in finite fields.\n\nLagrange's Four Square The
 orem states that every natural number can be\nwritten as a sum of four squ
 ares\, i.e. squares form an additive basis\nof order 4. Cauchy observed th
 at in a finite field F with q elements\,\nsquares form an additive basis o
 f order 2. Bourgain further\ngeneralized the problem and proved that for a
 ny subset A in F\, writing\nAA={aa': a\,a'∈ A}\, we have 3AA=F whenever 
 |A|>q^{3/4}. \n\nIn general\, for subsets A\,B in F with |A||B|>q\, one m
 ight ask that how\nmany copies of AB are enough to cover the entire space?
  The current\nrecord of this problem is due to Glibichuk and Rudnev. Using
  basic\nFourier analysis tools\, they achieved 10AB=F unconditionally and 
 8AB=F\nassuming symmetry (or anti-symmetry).\n\nIn this talk\, we will (ho
 pefully) go through the paper of Glibichuk\nand Rudnev.\n\nMC 5417\n 
DTSTAMP:20250516T073810Z
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BEGIN:VEVENT
UID:6826eb620e530
DTSTART;TZID=America/Toronto:20250401T140000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20250401T150000
URL:/pure-mathematics/events/logic-seminar-75
SUMMARY:Logic Seminar
CLASS:PUBLIC
DESCRIPTION:Summary \n\nMARK POOR\, CORNELL UNIVERSITY\n\nSome results abou
 t the pseudoarc and its homeomorphism group\n\nIt is known that the so cal
 led pseudoarc can be represented as a\nquotient of a zero-dimensional comp
 act \"prespace\" under an appropriate\nequivalence relation (which is an i
 nverse limit of linear graphs)\, and\nthe automorphisms of this prespace d
 ensely embeds into the\nhomeomorphism group of the pseudoarc. Although thi
 s embedding is only\ncontinuous\, not a homeomorphic embedding\, we can ac
 tually characterize\nthe topology inherited from the homeomorphism group i
 ntrinsically\,\nonly in terms of the prespace. Using this characterization
  we show\nthat not all homeomorphisms are conjugate to an automorphism\, a
 nd we\ngive a second proof to Kwiatkowska's conjecture\, namely that there
 \nexists a homeomorphism with a dense conjugacy class.\n\nThis is joint wo
 rk with S. Solecki.\n\nMC 5479\n 
DTSTAMP:20250516T073810Z
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