Organizers

dr hab. Andrzej Weber, prof. ucz.
dr Krzysztof Ziemiański

Information

Wednesdays, 10:30 a.m. , room: 4070

Home page

http://duch.mimuw.edu.pl/~aweber/STA/

Research fields

Algebraic and Geometric Topology

List of talks

March 23, 2021, 4:30 p.m.
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 …
March 16, 2021, 4:30 p.m.
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 …
March 9, 2021, 4:30 p.m.
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
Jan. 26, 2021, 4:30 p.m.
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 …
Jan. 19, 2021, 4:15 p.m.
Jörg Schürmann (Munster)
Equivariant) characteristic classes of singular toric varietie ()
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.
Dec. 22, 2020, 4:30 p.m.
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 …
Dec. 15, 2020, 4:30 p.m.
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 …
Dec. 8, 2020, 4:15 p.m.
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. …
Dec. 1, 2020, 4:30 p.m.
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 …
Nov. 24, 2020, 4:30 p.m.
Stanisław Betley (MIMUW)
Lifting functors from F to P
https://www.mimuw.edu.pl/~aweber/STA/20.11.24.pdf
Nov. 17, 2020, 4:30 p.m.
Richárd Rimányi (UNC Chapel Hill)
Mirror symmetry in Schubert calculus
In Schubert calculus we study the cohomology ring of Grassmannians and other geometrically relevant spaces, together with their distinguished bases of Schubert classes. Recent developments include: (a) generalizing the cohomology theory to K theory and …
Nov. 10, 2020, 4:30 p.m.
Tomasz Maszczyk (MIMUW)
Homotopy *Creatio Ex Nihilo*
We realize the Pareigis Hopf algebra, which encodes the monoidal structure of the category of complexes (via the Pareigis transform which is the identity on objects), as a universal quantum symmetry of the algebra of …
Nov. 3, 2020, 4:30 p.m.
Wojciech Politarczyk (UW)
Linking forms of higher branched covers of knots
It is a common practice in knot theory to study knots in terms of branched coverings of the three-sphere branched along the knot in question. In particular, one can use the linking form of the …
March 11, 2020, 4:30 p.m.
Andrzej Szczepański (UG)
Płaskie rozmaitości z reprezentacją holonomii typu kwaternionowego
Podam przykład płaskiej rozmatości wymiaru 48, której reprezentacja holonomii ma wlasność taką że jej wszytkie R-nieprzywiedlne skladniki są typu kwaternionowego. Wszystkie powyższe pojecia zostaną zdefiniowane i omówione na początku wykładu. Metody - analiza 2-group niskiego …
March 4, 2020, 4:30 p.m.
Wojciech Politarczyk (UW)
Casson-Gordon invariants and knot concordance