2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148435We present a detailed analysis of the GKZ(Gel'fand, Kapranov and Zelevinski) hypergeometric systems in the context of mirror symmetry of Calabi-Yau hypersurfaces in toric varieties. As an application we will derive a concise formula for the prepotential about large complex structure limits. (Talk given at the Taniguchi Symposium ``Topological Field Theory, Primitive Forms and Related Topics'' December, 1996)28 pages, LaTeX. (The statements in Prop.4.7 and Claim 5.8 are clarified.)Algebraic Geometrytext