2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/134782Let S be a polynomial ring over a field of characteristic zero in finitely may variables. Let T be an unramified, finitely generated extension of S with $T^\times = k^\times$. Then T = S.16 pages, Examine the proof(2) in Theorem 2.1Commutative AlgebraAlgebraic Geometry13C20text