2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/172186We investigate the structures of Calabi-Yau differential equations and the relations to the arithmetic of the pencils of Calabi-Yau varieties behind the equations. This provides explanations of some observations and computations in a recent paper by Samol and van Straten.20 pagesAlgebraic Geometrytext