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Cotygodniowe seminarium badawcze
2021-03-30, godz. 16:30, Zoom: 892 1108 9551 Password - type the number equal to rk(H^2((S^1)^{200};Z))
Denis Nardin (Regensburg)
The theory of quadratic and symmetric bilinear forms over rings has traditionally been more developed when 2 is invertible in the ring. In this talk we will present a new approach allowing to put some order in the various flavours of quadratic forms one could define when 2 is not invertible, and we ...
2021-03-23, godz. 16:30, Zoom: 892 1108 9551 Password - type the number equal to rk(H^2((S^1)^{200};Z))
Tibor Macko (Slovak Academy of Sciences)
Cobordisms of quadratic chain complexes
A fundamental problem in surgery theory is to decide whether a given finite CW-complex X of dimension n>=5 satisfying Poincare duality is homotopy equivalent to a topological manifold. In the classical surgery theory due to Browder-Novikov-Sullivan-Wall this question is answered by a two-stage ob...
2021-03-16, godz. 16:30, Zoom: 892 1108 9551 Password - type the number equal to rk(H^2((S^1)^{200};Z))
Bruno Stonek (IMPAN)
Tensors of Thom spectra with spaces: generalizing Mahowald's Thom isomorphism
The topological Hochschild homology (THH) of a commutative ring spectrum R can be expressed as a tensor with a circle. More generally, one can tensor R with any space X. In this talk we will introduce this construction, then look at the case where R is a Thom spectrum Mf of an E_infty map G\to Pic(R...
2021-03-09, godz. 16:30, Zoom: 892 1108 9551 Password - type the number equal to rk(H^2((S^1)^{200};Z))
Patryk Jaśniewski (UW)
Homological structure of the category of strict polynomial functors of prime degree p
https://www.mimuw.edu.pl/~aweber/STA/21.03.09.pdf ...
2021-01-26, godz. 16:30, Zoom: 811 1192 8889, pass: proszę wpisać liczbę równą rk(H^2((S^1)^{200};Z))
Andrzej Szczepański (UG)
Combinatorial Hantzsche-Wendt group
Let n\in N. By a combinatorial Hantzsche-Wendt group we shall understand a finite presented group G_n = {x_1, ..., x_n | x_i^{-1} x_j^2 x_i x_j^2 \forall i\neq j}. During a talk I will present properties (topological, homological) of the above group. Moreover, some relations ...
2021-01-19, godz. 16:15, Zoom: 811 1192 8889 Password - type the number equal to rk(H^2((S^1)^{200};Z))
Jörg Schürmann (Munster)
(Equivariant) characteristic classes of singular toric varieties
In this survey talk, we discuss for singular toric varieties different (equivariant) characteristic classes like Chern, Todd, L and Hirzebruch classes, with applications to (weighted) lattice points counting and Euler-MacLaurin type formulae for lattice polytopes. ...
2020-12-22, godz. 16:30, Zoom: 811 1192 8889, pass: proszę wpisać liczbę równą rk(H^2((S^1)^{200};Z))
Józef Przytycki (George Washington University)
What is new in skein modules of 3-manifolds? - Personal perspective.
Skein modules of 3-manifolds have had their renaissance in the last 5 years. It is to a great extend because of interest in them by theoretical physicists, in particular Edward Witten. I will discuss Witten conjecture on the structure of the Kauffman bracket skein module of closed 3-manifolds, and a...
2020-12-15, godz. 16:30, Zoom: 811 1192 8889, pass: proszę wpisać liczbę równą rk(H^2((S^1)^{200};Z))
Krzysztof Ziemiański (MIMUW)
About directed spaces and braid groups
Precubical sets are important examples od directed space; they also play an important role in concurrency theory. The main goal of this talk is to show that the space of directed paths on the final precubical set is homotopy equivalent to the disjoint union of configuration spaces of n points on the...
2020-12-08, godz. 16:15, 4070
Maciej Markiewicz (MIMUW)
Torres formula for multivariable link signature
Multivariable Levine-Tristram signature is an invariant of links introduced by D.Cimasoni and V.Florens in their 2005 paper. It is a function from the m-th power of the unit complex circle with 1 removed to integers. It has an interpretation in terms of 4-dimensional topology via a formula which all...
2020-12-01, godz. 16:30, Zoom: 811 1192 8889, pass: proszę wpisać liczbę równą rk(H^2((S^1)^{200};Z))
Marcin Wrochna (Oxford)
An algorithmist's journey through topology
An important part of algorithmics is devoted to studying the problem of satisfying systems of constraints – or, equivalently – finding homomorphisms between finite structures such as graphs. I will present several new applications of algebraic topology to purely combinatorial and algorit...
