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O objetivo da pesquisa foi determinar a influência da aplicação da representação semiótica na aprendizagem de conceitos matemáticos básicos da estrutura algébrica de grupo em estudantes do ensino superior. Aplicando o método experimental obteve-se: no pós-teste, os alunos do grupo controle localizaram-se no domínio receptivo; mas, o grupo experimental alcançou o domínio autônomo. Concluindo que a aplicação da representação semiótica influe positivamente e significativamente na aprendizagem dos conceitos básicos da estrutura de grupo dos referidos alunos. The objective of the research was to determine the influence of the application of semiotic representation in the learning of basic mathematical concepts of group algebraic structure in higher education students. Applying the experimental method it was obtained: in the post-test, the students of the control group were located in the receptive domain; but the experimental group achieved autonomous dominance. Concluding that the application of semiotic representation positively and significantly influences the learning of the basic concepts of the group structure of said students. El objetivo de la investigación fue determinar la influencia de la aplicación de la representación semiótica en el aprendizaje de conceptos matemáticos básicos de la estructura algebraica de grupo en estudiantes de educación superior. Aplicando el método experimental se obtuvo: en el pos-test, los estudiantes del grupo control se ubicaron en el dominio receptivo; pero el grupo experimental logró el dominio autónomo. Concluyendo que la aplicación de la representación semiótica influye positiva y significativamente en el aprendizaje de los conceptos básicos de la estructura de grupo de dichos estudiantes.

We prove that, if $x$ and $q\leqslant x^{1/16}$ are two parameters, then for any invertible residue class $a$ modulo $q$ there exists a product of exactly three primes, each one below $x^{1/3}$, that is congruent to $a$ modulo $q$., 6 pages, to submitted to Journal de Th\'{e}orie des Nombres de Bordeaux. Small corrections to previous version

This paper is devoted to the proof of boundedness of bilinear smooth square functions. Moreover, we deduce boundedness of some bilinear pseudo-differential operators associated with symbols belonging to a subclass of $BS^0_{0,0}$., Comment: 27 pages

In this paper we use uniform algebra techniques and recent results on separation properties to prove several division theorems for closed subalgebras of L∞ containing H∞. We also study ideals having the local approximation property and we show that not every ideal in such algebras is local. Fil: Suarez, Fernando Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Saavedra 15. Instituto Argentino de Matemática Alberto Calderón; Argentina