2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/112762A somewhat pretentious presentation of number systems (N, Z, Q, R, C, Q_p, >...). The problem of a p-adic characterisation of good-reduction p-adic curves is posed.Notes from a talk at Allahabad, February 2006History and Overviewtext