2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/122139We determine the isomorphism classes of Jordan algebras in dimension two over the field of real numbers. Using techniques of non-standard analysis we study the properties of the variety of Jordan algebras, and also the contractions among these algebras.20 pages. Text in frenchRings and Algebras17C10; 17C99text