Displaying similar documents to “Contractions over generalized metric spaces.”

The universal separable metric space of Urysohn and isometric embeddings thereof in Вanach spaces

M. Holmes (1992)

Fundamenta Mathematicae

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This paper is an investigation of the universal separable metric space up to isometry U discovered by Urysohn. A concrete construction of U as a metric subspace of the space C[0,1] of functions from [0,1] to the reals with the supremum metric is given. An answer is given to a question of Sierpiński on isometric embeddings of U in C[0,1]. It is shown that the closed linear span of an isometric copy of U in a Banach space which contains the zero of the Banach space is determined up to...