Seminar | Department of Mathematics

U. Haifa Topology & Geometry seminar: Wednesday, Apr. 2, 2025. Speaker: Tom Bachmann (Mainz). Title: “Coalgebras in p-adic homotopy theory”.

Author: raphy April 3, 2025

I will report on joint work with Robert Burklund in which we remove finiteness assumptions from a theorem of Mandell. Specifically, we show that the canonical functor from p-adic,nilpotent spaces to (E∞-) coalgebras over F¯p is fully faithful. Recording:https://us02web.zoom.us/rec/share/qlTnQPOI-W7GyhRTkK3DB5PZdP1WiEgcOsHaZ661TmES9VsoM_pqHWgFji4whSJd.0MWjSTm7kOZ12uaH

Geometry and Topology Seminar, News, Seminar

U. Haifa Topology & Geometry seminar: Wednesday, Mar. 19, 2025. Speaker: Marina Prokhorova (Haifa). Title: “Index theory for unbounded Fredholm operators”.

Author: raphy March 19, 2025

A linear operator on a Hilbert space is called Fredholm if its kernel and cokernel are finitedimensional. As was shown in classical works of Atiyah, J¨anich, and Singer, the space of bounded Fredholm operators represents even K-theory; its subspace consisting…
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Geometry and Topology Seminar, Seminar

U. Haifa Topology & Geometry seminar: Wednesday, Jan. 15, 2025. Speaker: Irakli Patchkoria (Aberdeen). Title: “Chromatic congruences and Bernoulli numbers”.

Author: raphy January 17, 2025

For every n and a fixed prime p, we construct a new congruence for the orbifold Euler characteristic of a group which we call the chromatic congruence at the height n. Here the word “chromatic” refers to the chromatic stable…
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Seminar

U. Haifa Topology & Geometry seminar: Wednesday, Nov. 27, 2024. Speaker: Giuseppe Leoncini (Università degli Studi di Milano Statale). Title: “Universal homotopy theories in the enriched context’”.

Author: raphy November 27, 2024

I will put forward a possible generalization of Dugger’s theorem on universal homotopy theories, in enriched homotopy theory, following previous work of Dugger and Shipley for the case of enrichment over Abelian groups. I will discuss what can be done…
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Geometry and Topology Seminar, Seminar

U. Haifa Topology & Geometry seminar: Tuesday, Apr. 9, 2024. Speaker: Kaif Hilman (Bonn). Title: “Equivariant Poincare duality for finite groups and fixed points methods”.

Author: raphy April 9, 2024

In this talk, I will introduce the notion of Poincar´e duality spaces in the equivariantsetting for finite groups and discuss an approach relating equivariant Poincar´e duality withPoincar´e duality on the fixed points. Time permitting, I will also indicate how one…
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Geometry and Topology Seminar, Seminar

U. Haifa Topology & Geometry seminar: Tuesday, Mar. 5, 2024. Speaker: Surojit Ghosh (IIT Roorkee). Title: “Higher homotopy invariants of diagrams of chain complexes”.

Author: raphy March 5, 2024

While encoding the homotopy invariants in a model category, one approach (due to Heller and Grothendieck) is to determine certain higher invariants in the homotopy categories of all small diagram categories. In this talk, we provide an explicit approach to…
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Geometry and Topology Seminar, Seminar

U. Haifa Topology & Geometry seminar: Tuesday, Jan. 23, 2024. Speaker: Damien Calaque (Montpellier). Title: “Shifted symplectic reduction”.

Author: raphy January 24, 2024

This talk will be on Zoom:https://us02web.zoom.us/j/83920631646?pwd=cWZRWjllZWEvdjVSNVhTdUxMMGlwUT09 I will start explaining that Hamiltonian reduction can be understood as a particular instance of Lagrangian intersections, within the framework of shifted symplectic geometry. One can see this first part of the talk as…
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Geometry and Topology Seminar, Seminar

U. Haifa Topology & Geometry seminar: Tuesday, Jan. 9, 2024. Speaker: Carles Casacuberta (Barcelona). Title: “Homotopy reflectivity is equivalent to the weak Vopenka principle”.

Author: raphy January 9, 2024

Homotopy localizations with respect to arbitrary (possibly proper) classes of maps are known to existin suitably structured model categories assuming the validity of Vopenka’s principle from set theory.Through recent progress in large cardinal theory, we prove that the existence of…
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Geometry and Topology Seminar, Seminar

U. Haifa Topology & Geometry seminar: Sunday, Dec. 24, 2023. Speaker: Ayelet Lindenstrauss (Indiana). Title: “Loday Constructions on Spheres and Tori”.

Author: raphy December 25, 2023

Given a commutative ring or ring spectrum, there is a functor from finite sets to commutative rings sending a set to the tensor product of copies of the ring (or ring spectrum) indexed by that set. The Loday construction extends…
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Geometry and Topology Seminar, Seminar

U. Haifa Topology & Geometry seminar: Sunday, Nov. 21, 2023. Speaker: Josefien Kuijper (Stockholm University). Title: “Compactly supported cohomology theories of varieties and six-functor formalisms”.

Author: raphy November 21, 2023

Time: 11:00 AM Recording:https://us02web.zoom.us/rec/share/9f42mPT6f_DrAb7PSelgFJxj4VF5XyBFR_w9Q_1pmd0l7N8vBrZA5s9tHsXNyc-I.WUIy_fbLn_vZCL1l Abstract: In the first part of this talk I will discuss a result about the existence of compactly supported versions of cohomology theories of varieties. In the second part of the talk I will discuss a…
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Geometry and Topology Seminar, Seminar