Tietze extension theorem
Continuous maps on a closed subset of a normal space can be extended / From Wikipedia, the free encyclopedia
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In topology, the Tietze extension theorem (also known as the Tietze–Urysohn–Brouwer extension theorem or Urysohn-Brouwer lemma[1]) states that any real-valued, continuous function on a closed subset of a normal topological space can be extended to the entire space, preserving boundedness if necessary.