Un ejemplo de teoría de homotopía en los grupos abelianos.
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Luis Javier Hernandez Paricio (1982)
Collectanea Mathematica
Clemens Berger (1995)
Bulletin de la Société Mathématique de France
Michel Zisman (1977/1978)
Manuscripta mathematica
Michel André (1982)
Manuscripta mathematica
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