Carə tuttə, vi invitiamo al seminario dei Baby Geometri della prossima settimana: Giovedì 19 Marzo 2026, alle ore 11:15 Presso l’Aula Bianchi Scienze (Palazzo della Carovana) Simone Tagliente (Rényi Institute of Mathematics and Eötvös Loránd University, Budapest) terrà un seminario dal titolo: Exotic 4-manifolds with infinite dihedral fundamental group di cui riportiamo l'abstract: We construct infinite families of exotic 4-manifolds with infinite dihedral fundamental group. This group is the non-trivial semi-direct product of Z and Z_2, or equivalently the free product of Z_2 and Z_2. The key idea of the construction is to assemble simply-connected building blocks to construct the universal cover, and then to perform surgeries in an equivariant way. The diffeomorphism types of these exotic manifolds are distinguished by the Seiberg-Witten invariants of their double covers, while to show that their homeomorphism type is the same we use a recent result of Hillman-Kasprowski-Powell-Ray. Vi ricordiamo infine che potrete trovare informazioni sui prossimi seminari sul nostro sito <https://sites.google.com/view/babygeometri>. Tutte le persone interessate sono invitate a partecipare. A presto, Lə organizzatorə