Buongiorno, Ricordo a tutti gli interessati che dal 22 al 25 Giugno a Pisa si svolgerà CATA IV, di cui riporto l'annuncio. Le iscrizioni si chiuderanno il 30 Aprile. Saluti, Carlo Combinatorial Algebraic Topology, and Applications IV ----------------------------------------- https://gecogedi.dimai.unifi.it/event/1448/ Date: Monday, Jun 22, 2026 -- Thursday, Jun 25, 2026 Place: Pisa, Italy The workshop “Combinatorial algebraic topology and applications” is at its fourth edition. The first, second, and third editions were held in Pisa at the Centro di Ricerca Matematica “E. De Giorgi” on the 27-28 November 2023, 1-4 October 2024, and 16-19 September 2025, respectively. The main topics of the conference are combinatorics and algebraic topology (broadly intended), as well as their applications to different fields (e.g. data analysis, neural sciences and economics). The aim of the workshop is to gather researchers with common interest in the above topics and to create an atmosphere of discussion where to share ideas. For its fourth edition, the workshop will focus specifically on the following topics: applied (algebraic) topology, low-dimensional and geometric topology, and topological combinatorics. The workshop will consist of ten one-hour talks from invited speakers, along with contributed talks by selected participants. The talks will cover both theoretical and applied aspects of the subjects. The invited speakers are at different stages of the academic career, including professors, lecturers, PhD students and post-docs. Moreover, to stimulate discussion and exchange of ideas, the workshop will include free discussions, contributed talks, and possibly a problem session. We are committed to ensure gender balance as well as broad participation across academic backgrounds and career stages. Registration is free, though mandatory, due to limitations in the number of participants. Depending on funding limited support may be available for junior participants, with priority given to early registrations and contributed speakers. The *deadline for contributed talks and support is the 31st of March 2026*. The *deadline for registration is the 30th of April 2026*. LIST OF CONFIRMED SPEAKERS Valentina Bais (SISSA) Bruno Benedetti (University of Miami) Jelena Grbic (University of Southampton) Dmitrii Korshunov (Institut de mathématiques de Jussieu –Paris Rive Gauche) Jean- Baptiste Meilhan (Université Grenoble Alpes) Pegah Pournajafi (Collège de France) Francesca Pratali (Universiteit Utrecht) Anne-Laure Thiel (Université Bourgogne Europe) Francesco Vaccarino (Politecnico di Torino) So Yamagata (Fukuoka University) Organizing Commitee: L. Caputi, C. Collari, G. Menara Invited Speakers: webpage of the workshop: https://indico.sns.it/event/134/