Revista Mexicana de Investigacion EducativaHernandez Rosete, Daniel; Flores, Javier y Echavarria, Laura. (2011). Sin pecado concebido. Sida y embarazo en el libro de sexto de ciencias naturales. Revista Mexicana de Investigacion Educativa. Vol. 49, n掳 16, pp. 471-488. Disponible en http:...
approach to non-abelian cohomology [4] and, using the notion of a crossed bimodule, a second pointed set of cohomology is defined with coefficients in a crossed module, and Guin's six-term exact cohomology sequence is extended to a nine-term exact sequence of cohomology up to dimension 2...