10. Applications between metric spaces II
10.1 Application extension
Tietze extension theorem (Lebesgue (1907), Brouwer (1912), Tietze (1915), Urysohn (1925)). A continuous function f defined on a closed subset X of a topological space separated T 4 and having values in can be extended to a continuous function
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Applications between metric spaces II
Property preservation and invariance
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