2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/152367An alternative organization for Differential and Integral Calculus, based on an extension of real numbers that include infinitesimal and infinite quantities, is presented. Only Elementary Set Theory is used, without reference to methods or results from Mathematical Logic.24 pages, plain TeX, no figuresFunctional Analysistext