2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149916We construct a surface of general type with invariants \( χ= K^2 = 1 \) and torsion group \( \Bbb{Z}/{2} \). We use a double plane construction by finding a plane curve with certain singularities, resolving these, and taking the double cover branched along the resulting smooth curve.13 pages, AMS-LaTex version 1.1Algebraic Geometrytext