2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/107781The aim of this paper is to extend the theory of standard subalgebras of finite dimensional simple Lie algebras to infinite dimensional Lie algebras. We construct and characterize a class of standard subalgebras of affine Kac-Moody algebra.12 pages, new version with misprints correctedRings and AlgebrasRepresentation Theory17B20, 17B67, 17B30, 17B65text