Cari colleghi, vi segnalo che giovedì 23 aprile, alle 14:30 in aula seminari, Alejandro Gil-Garcìa terrà un seminario di geometria. Trovate qui sotto titolo e abstract. Per chi fosse interessato, ci troviamo nell'atrio davanti all'aula riunioni alle 13 per andare a pranzo con lo speaker. Title: The algebraic square of an irreducible complex spinor Abstract: We characterize, in every dimension and signature, the algebraic squares of an irreducible complex spinor as a pair of exterior forms satisfying a prescribed system of algebraic relations that we present in terms of the geometric product of the underlying quadratic vector space. As a result, we obtain a general correspondence between irreducible complex spinors and algebraically constrained exterior forms, which clarifies the subtle relationship between spinors and exterior forms and contributes towards the understanding of spinors as the square root of geometry. Time permitting, we will explore the differential counterpart of this correspondence. This is joint work with Carlos Shahbazi. The talk is based on https://arxiv.org/abs/2510.13801. Saluti Diego