Author Archive: raphy

U. Haifa Topology & Geometry seminar: Sunday, November 30, 2025, 17:00. Speaker: Nima Rasekh (Greifswald). Title: “Hochschild Homology of Bicategories”.

Hochschild homology was originally introduced as an invariant of associative algebras that generalizes the commutator. In subsequent decades, it has been extended both in categorical directions, such as to dg-categories, and in topological ones, such as to ring spectra. These…
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U. Haifa Topology & Geometry seminar: Wednesday, November 26, 2025. Speaker: Lyne Moser (Regensburg). Title: “Modeling (∞, 1)-categories with Segal spaces”.

Classically, (∞, 1)-categories are modeled by complete Segal spaces. However, many examples first arise as non-complete Segal spaces, which are then completed abstractly to obtain an (∞, 1)-category. With Nuiten, we construct a model of (∞, 1)-categories in which completeness…
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Colloquium: Tuesday Dec. 2, 2025 (14:00, room 614). Speaker: Galyna Livshyts (Georgia Tech). Title: “Non-round Blaschke-Santalo inequalities, improved Brascamp-Lieb inequalities, and more”.

In this talk, we will survey a collection of questions (and partial answers) regarding the role of symmetry in the inequalities of isoperimetric type. We will speculate why symmetry might help with improving isoperimetric properties, recall the B-conjecture, and will…
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Colloquium: Tuesday Nov. 11, 2025 (14:00, room 614). Speaker: Salvatore Stella (l’Aquila). Title: “Combinatorial Invariance Conjecture via flipclasses”.

Abstract: The Combinatorial Invariance Conjecture for Kazhdan–Lusztig polynomials posits that the Bruhat graph associated with two elements in a Coxeter group uniquely determines the corresponding Kazhdan–Lusztig polynomial. This conjecture has been a topic of research for over forty years, with…
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