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Cotygodniowe seminarium badawcze
Organizatorzy
- dr hab. Andrzej Weber, prof. UW
- dr Krzysztof Ziemiański
Informacje
środy, 10:30 , sala: 4070Strona domowa
http://duch.mimuw.edu.pl/~aweber/STA/Dziedziny badań
Lista referatów
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4 grudnia 2019 16:15
Piotr Achinger (IMPAN)
Condensed mathematics, after Clausen and Scholze
Condensed mathematics is an over-arching framework for dealing with topological groups, rings, and modules recently proposed by Clausen and Scholze. A "condensed set" is, modulo set-theoretic issues, a sheaf on the category of profinite sets, …
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13 listopada 2019 16:15
Andrzej Szczepański (UG)
Spajające grupy Bieberbacha (za Mariusem Dadarlatem)
C* - algebrę A nazywamy spajajacą (connective) o ile istnieje *-monomorfizm z A do pewnej "uniwersalnej" C*-algebry. C* - algebrę grupową C*(G) nazywamy spajajacą o ile jej ideał augumentacji (jadro odwzorowania C*(G) ----> \C) jest …
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6 listopada 2019 16:15
Andrzej Weber (UW)
O ekwiwariantnych eliptycznych kohomologiach
Przypomnę klasyczne eliptyczne kohomologie, tak jak były definiowane w atykule Graema Segala "Elliptic Cohomology" z 1988-go roku i porównam z nowym podejściem opisanym w pracy Nory Ganter "The elliptic Weyl character formula", arXiv:1206.0528.
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30 października 2019 16:15
Jkub Koncki (UW)
Motivic Chern Classes Of Configuration Spaces
We calculate equivariant motivic Chern class for configuration space of smooth variety and space of vectors with different directions. We prove formulas for generating series of these classes. We generalize localization theorems results about BB-decomposition …
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16 października 2019 16:15
Wojciech Politarczyk (UW)
Non-slice linear combinations of iterated torus knots
Algebraic knots are knots which arise as links of isolated singularities of complex curves. Lee Rudolph conjectured that the set of algebraic knots is linearly independent in the smooth knot concordance group. Rudolph’s conjecture is …
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4 lipca 2019 14:15
Józef Przytycki (George Washington University)
Wyznaczniki Grama motywowane teoria węzłów
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11 czerwca 2019 16:15
Łukasz Grabowski (Lancaster University)
Approximation of groups with respect to the rank metric
Abstract: I'll talk about an ongoing joint work with Gabor Elek about approximation of groups with respect to the rank metric. The basic question is the following variant of the Halmos problem about commuting matrices: …
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4 czerwca 2019 16:15
Thomas Koberda (University of Virginia)
Algebra versus regularity for group actions on one-manifolds
JOINT WITH SIMONS SEMESTER I will survey some results concerning the algebraic structure of finitely generated groups which admit faithful actions on compact one-manifolds. I will concentrate on continuous, C^1 , and C^2 actions, and …
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28 maja 2019 16:15
Genevieve Walsh (Tufts University)
Incoherence of many free by free groups
A group is coherent if every finitely generated subgroup is finitely presented. Free by cyclic groups are known to be coherent by work of Feighn and Handel. We show that many free by free groups …
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7 maja 2019 16:15
Mahan Mj (Tata Institute of Fundamental Research)
Coarse Extrinsic Geometry and surface-by-free groups
JOINT WITH SIMONS SEMESTER The notion of distortion of finitely generated subgroups H of finitely generated groups G, introduced by Gromov, is a first step towards studying extrinsic geometry of subgroups in the coarse setup. …
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30 kwietnia 2019 16:15
Marcin Sabok (McGill University, IMPAN)
On a conjecture of Gardner
JOINT WITH SIMONS SEMESTER In 1925, Tarski asked if a disc in the plane and a square of the same area are equidecomposable, i.e. if the disc can be partitioned into finitely many pieces which …
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16 kwietnia 2019 16:15
Michael W. Davis (Ohio State University)
The action dimension of a discrete group
Colloquim joint with Simons Semester A space is called a K(G,1) if its fundamental group is G and if its universal cover is contractible. The geometric dimension of G is the smallest dimension of a …
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2 kwietnia 2019 16:15
Pierre Pansu (Universite Paris-Sud)
Aspects of geometric group theory: growth, isoperimetry, Lp-cohomology
SIMONS SEMESTER COLLOQUIUM The growth and isoperimetry of finitely generated groups have been among its early interests. We shall show how they lead to today’s cohomological methods, notions of negative curvature and rigidity problems. https://www.impan.pl/en/activities/banach-center/conferences/19simons-xi
