2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/67271We prove modularity for a huge class of rigid Calabi-Yau threefolds over $\Q$. In particular we prove that every rigid Calabi-Yau threefold with good reduction at 3 and 7 is modular.to appear at: Proceedings of the Workshop on "Calabi-Yau Varieties and Mirror Symmetry", Fields Institute, Toronto, July 23-29, 2001 ; Fields Inst. Comm. Series, AMSNumber Theorytext