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Tietze Extension Theorem for n-dimensional Spaces

100%

Pąk K.

Formalized Mathematics

2014

tom 22

nr 1

11-19

In this article we prove the Tietze extension theorem for an arbitrary convex compact subset of εn with a non-empty interior. This theorem states that, if T is a normal topological space, X is a closed subset of T, and A is a convex compact subset of εn with a non-empty interior, then a continuous function f : X → A can be extended to a continuous function g : T → εn. Additionally we show that a subset A is replaceable by an arbitrary subset of a topological space that is homeomorphic with a convex compact subset of En with a non-empty interior. This article is based on [20]; [23] and [22] can also serve as reference books.

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1 Formalized Mathematics

1 Pąk K.

1 2014

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Tietze Extension Theorem for n-dimensional Spaces