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Jump to navigationJump to search- 08:59, 22 January 2026 K-theoretic Poitou-Tate duality & the heart of D^b of locally compact abelian groups (hist | edit) [1,356 bytes] Wic42659 (talk | contribs) (Created page with "(joint with Fei Ren, Wuppertal University) Number theory part: I will give a little introduction to K-theoretic Artin maps à la Clausen and K-theoretic Poitou-Tate duality à la Blumberg-Mandell. That's a somewhat new viewpoint on class field theory. Topology part: LCA groups show up as a surprising model for the compactly supported side of said duality, leading to Clausen's cool way to uniformly describe the non-Galois side of class field theory as K_1(LCA_F) for F t...")
- 14:24, 16 January 2026 A generalisation of Day convolution for operad-like structures (hist | edit) [781 bytes] Ghd08439 (talk | contribs) (Created page with "A fundamental construction in higher algebra is that of Day convolution. This construction, if it exists, defines an internal hom-object in the ∞-category of ∞-operads. In this talk, I will describe an explicit condition for the existence of such internal hom-objects for other operad-like structures. Even in the case of ∞-operads, our proof is very different from previous constructions. The existence condition we obtain is very similar to the Conduché criterion fo...")
- 14:22, 16 January 2026 A generalisation of Day convolution for Operad-like structures (hist | edit) [778 bytes] Ghd08439 (talk | contribs) (Created page with "A fundamental construction in higher algebra is that of Day convolution. This construction, if it exists, defines an internal hom-object in the oo-category of oo-operads. In this talk, I will describe an explicit condition for the existence of such internal hom-objects for other operad-like structures. Even in the case of oo-operads, our proof is very different from previous constructions. The existence condition we obtain is very similar to the Conduché criterion for d...")
- 13:42, 13 January 2026 Semifree isovariant Poincaré spaces and the gap condition (hist | edit) [560 bytes] Vom41941 (talk | contribs) (Created page with "The study of group actions on manifolds is a classical problem in geometric topology. In this talk, I will introduce the notion of isovariant G-Poincaré spaces, a homotopical notion interpolating between closed smooth G-manifolds and G-Poincaré spaces. The main result shows that, for a periodic finite group G and under suitable codimension hypothesis, the space of isovariant structures on a G-Poincaré space is highly connected. This is a useful tool for constructing m...")
- 11:45, 16 December 2025 Grothendieck-Witt theory of pushouts (hist | edit) [554 bytes] Wic42659 (talk | contribs) (Created page with "Given a Poincaré-duality space X much information can be gathered from its GW-theory. As GW-theory is generally hard to compute, one important question is how GW-theory behaves under gluing of spaces. In this talk I will present a criterion which guarantees a splitting of the GW-theory of a pushout in a part fitting in a Mayer-Vietoris sequence and an error term. The criterion applies more generally for localising invariants and allows generalizations of splitting theor...")
- 12:45, 22 November 2025 The cobordism spectrum of Poincare spaces (hist | edit) [631 bytes] Cid36224 (talk | contribs) (Created page with "Abstract: Based on joint work-in-progress with Bianchi, Kirstein, and Kremer, I will introduce a proposed notion of categorical symmetric spectra as well as an enlargement of the category of Poincare categories which we call that of bundled categories. As applications, we construct the commutative ring cobordism spectrum of Poincare spaces equipped with Pontryagin-Thom maps, and give a new proof that K-theory is lax symmetric monoidal. Time permitting, I will also discus...")
- 09:50, 6 November 2025 Duality for K-theory in motivic homotopy theory (hist | edit) [1,235 bytes] Cid36224 (talk | contribs) (Created page with "There is an action of K-theory on G-theory, as observed by Quillen and later Thomason–Trobaugh. In recent work, Fangzhou Jin internalized this story to SH by constructing a representing object GGL for G-theory in the six functor formalism of KGL-modules in the motivic homotopy category. The object GGL is stable under exceptional pullback and coincides with KGL over any regular base. It is thus reasonable to ask whether GGL is a dualizing object for KGL-modules. For an...")
- 09:26, 6 November 2025 Regional Geometry and Topology Meeting (hist | edit) [339 bytes] Brv60445 (talk | contribs) (Created page with "<br> <font size="+3" color="#009b77"> Regional Geometry and Topology Meeting<br> </font> <br> <font size="+1"> :<b>Date:</b> Regensburg, 23.06.2017 <br> </font>")
- 05:52, 6 November 2025 Virtual workshop: Simplicial Volumes and Bounded Cohomology (hist | edit) [582 bytes] Hek43333 (talk | contribs) (Created page with "\veranstaltung{Virtual workshop: Simplicial Volumes and Bounded Cohomology}{21.09.-25.09.2020}{Regensburg/online}{Caterina Campagnolo, Roberto Frigerio, Clara Löh, Marco Moraschini}{Mihael Brandenbursky, Diego Corro, Carlos De la Cruz Mengual, Jmes Farre, Tschakik Gelander, Nicolaus Heuer, Alessandro Iozzi, Michał Marcinkowski, Nicolas Monod, Maria Beatrice Pozzetti, Stéphane Sabourau, Roman Sauer, Alessio Savini, Alessandro Sisto, Shi Wang}{Kommunikation}{Zielgruppen...")
- 05:49, 6 November 2025 Homotopy Theory Workshop (hist | edit) [302 bytes] Hek43333 (talk | contribs) (Created page with "\veranstaltung{Homotopy Theory}{05.05.2018}{Regensburg}{Justin Noel, Georgios Raptis}{Martin Frankland, Markus Land, Cary Malkiewich, Hoang-Kim Nguyen, Irakli Patchkoria}{Kommunikation}{Zielgruppen}{Resonanz}")
- 05:48, 6 November 2025 3rd Bavarian Geometry & Topology Meeting (hist | edit) [389 bytes] Hek43333 (talk | contribs) (Created page with "\veranstaltung{3rd Bavarian Geometry & Topology Meeting}{11.07.-12.07.2018}{Regensburg}{Markus Land Georgios Raptis}{Bernd Amann, Mauricio Bustamante, Daniel Fauser, Sebastian Hensel, Alexei Kudryashov, Caterine Meusburger, Mihaela Pilca, Wolfgang Steimle}{Teilnehmerliste}{Kommunikation}{Zielgruppen}{Resonanz}")
- 05:46, 6 November 2025 Manifolds and Groups 2017 (hist | edit) [558 bytes] Hek43333 (talk | contribs) (Created page with "\veranstaltung{Manifolds and Groups 2017}{25.09.-29.09.2017}{Ort}{c. Löh, S. Friedl}{Michael Boileau, Oleg Bogopolski, Michelle Bucher-Karlsson, Danny Calegari, Roberto Frigerio, Alexander Gaifullin, Bernhard hanke, Sebastian Hensel, Holger Kammeyer, Jean-Francois Lafont, Ian Leary, Claudio Llosa Isenrich, Wolfgang Lück, Saul Schleimer, Kevin Schreve, Peter Schwer, Alessandro Sisto, Richard Weidmann, Jesse Wolfson, Daniel Woodhouse}{Kommunikation}{Zielgruppen}{Resonanz}")
- 05:46, 6 November 2025 Non-Positively Curved Groups and Spaces (hist | edit) [342 bytes] Hek43333 (talk | contribs) (Created page with " \veranstaltung{Non-Positively Curved Groups and Spaces}{18.09.-22.09.2017}{Ort}{A. Engel, M. Marcinkowski}{Grigori Avramidi, Igor Belegradek, Camille Horbez, Aditi Kar, Jon McCammond, Dimitri Panov, Alessandro Sisto}{Kommunikation}{Zielgruppen}{Resonanz}")
- 05:43, 6 November 2025 Workshop "Women in Numbers Regensburg" (hist | edit) [282 bytes] Hek43333 (talk | contribs) (Created page with "\veranstaltung{Workshop "Women in Numbers Regensburg"}{28.06.2016}{Regensburg}{Antonella Perucca}{Evangelia Gazaki, Antonella Perucca, Franziska Wutz}{Teilnehmerliste}{Kommunikation}{Zielgruppen}{Resonanz}")
- 11:14, 24 October 2025 Nori motivic sheaves as sheaves of Nori motives (hist | edit) [714 bytes] Cid36224 (talk | contribs) (Created page with "Classically, the theory of Nori motives provides an unconditional candidate for the conjectural abelian category of mixed motives over a field of characteristic zero. In the last few years, it has been expanded to a theory of Nori motivic sheaves equipped with Grothendieck's six operations. In fact, two natural definitions of Nori motivic sheaves have been proposed: one by Ivorra--Morel (generalizing the universal property of Nori's abelian category), and one by Ayoub (g...")
