2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/63801We show that a general canonical curve is uniquely determined by the finite set of hyperplanes cutting theta-characteristics on it. Geometrical and combinatorial properties of the moduli space of stable spin curves are proved, which play an essential role.29 pages, Plain TeXAlgebraic Geometrytext