Buondì,

Con colpevole ritardo, segnalo un seminario di geometria per mercoledì prossimo (dopodomani). A presto, Bruno

SEMINARI DI GEOMETRIA 23-Mar-2022 - 16:00 Aula Magna - Dipartimento di Matematica Titolo: An arithmetic, hyperbolic, rational homology 3-sphere that bounds geometrically Leonardo Ferrari, Neuchatel (Svizzera)

Abstract: In this seminar, we'll introduce Davis and Januszkiewicz combinatorial techniques for building manifolds from right-angled polytope, as well as some topological properties inherited by these manifolds. We'll then present some obstructions to producing rational homology 3-spheres (QHS3) in this setting, and explain how to use these obstructions to improve tree-search algorithms for hyperbolic QHS3. We'll finally explain how to promote geodesical embeddings to geometrical bounds, and combine these tools to construct the first example of a hyperbolic, arithmetic, QHS3 that bounds geometrically.