Organizers

Information

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

Home page

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

Research fields

Algebraic Topology

List of talks

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
Feb. 26, 2020, 4:30 p.m.
Stefan Jackowski (UW)
Kwadraty Steenroda à la Mike Hopkins
Jan. 22, 2020, 4:15 p.m.
Joachim Jelisiejew (MIM UW)
Moduli spaces and algebraic K-theory
Jan. 8, 2020, 4:15 p.m.
Piotra Suwary (MIT)
Floer Homology via Semi-Infinite Dimensional Cycles
The basic idea behind Floer homology is to define homology groups of a functional on an infinite-dimensional space by mimicking the construction of Morse homology for finite dimensional manifolds. Various flavors of Floer homology have …
Dec. 11, 2019, 4:15 p.m.
Piotr Nowak (IMPAN)
T) dla grup automorfizmów grup wolnyc
Celem wykładu będzie udowodnienie twierdzenia o tym, że Aut(F_n), grupa automorfizmów grupy wolnej na n generatorach, ma własność (T) Kazhdana dla n>4. Własność (T) dla grupy G jest równoważna znikaniu kohomologii H^1(G,\pi) o współczynnikach w …
Dec. 4, 2019, 4:15 p.m.
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, …
Nov. 27, 2019, 4:15 p.m.
Marcin Chałupnik (UW)
Spektra funktorów wielomianowych
Nov. 20, 2019, 4:15 p.m.
Krzysztof Ziemiański (UW)
Języki automatów wielowymiarowych