Triangulaciones, el lema de Sperner y el teorema de punto fijo de Brouwer
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[ES] El objetivo de este trabajo es proporcionar una demostración elemental y poco conocida
del teorema del punto fijo de Brouwer, que se basa esencialmente en el lema de Sperner
(un resultado puramente combinatorio sobre triangulaciones de un n-símplex, fácil de probar)
y en una sencilla propiedad sobre recubrimientos cerrados de un n-símplex, debida
a Knaster, Kuratowski y Mazurkiewich. A su vez, señalemos que el teorema de Brouwer
implica el lema de Sperner
[EN] The aim of this work is to provide a quite elementary proof of Brouwer's Fixed Point Theorem, which is mainly based on a combinatorial simple result known as Sperner's Lemma, dealing with triangulations of a non degenerated n-simplex and on a property of closed coverings of the n-simplex, due to Knaster, Kuratowski and Mazurkiewickz. It's worth mentioning that Brouwer's Theorem implies Sperner's Lemma.
[EN] The aim of this work is to provide a quite elementary proof of Brouwer's Fixed Point Theorem, which is mainly based on a combinatorial simple result known as Sperner's Lemma, dealing with triangulations of a non degenerated n-simplex and on a property of closed coverings of the n-simplex, due to Knaster, Kuratowski and Mazurkiewickz. It's worth mentioning that Brouwer's Theorem implies Sperner's Lemma.
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Traballo Fin de Grao en Matemáticas. Curso 2019-2020
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