2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59931The paper investigates some aspects of the geometry and the arithmetic of a non-rigid Calabi-Yau threefold. Particular emphasis is given to the study of its L-function L(H^3,s) and the Galois representation.49 pages. Updated versions will also appear on: http://www.math.toronto.edu/~kcNumber TheoryAlgebraic Geometry11G40;14G40text