2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/158601Long ago, in math.AG/0112004, we pledged more details on the algebraic version of Chen-Ruan's math.AG/0103156. This is it.59 pages, 9 sections, 3 appendices and one figure. Several minor improvementsAlgebraic GeometrySymplectic Geometry14N35; 14A20; 14H10text