2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149451We construct Calabi-Yau manifolds and their mirrors from K3 surfaces. This method was first developed by Borcea and Voisin. We examined their properties torically and checked mirror symmetry for Calabi-Yau 4-fold case. From Borcea-Voisin 3-fold or 4-fold examples, it may be possible to probe the S-duality of Seiberg -Witten.Latex, 26 pages, Replacement: toric data was addedHigh Energy Physics - Theorytext