
 Tietze extension theorem Article, Tietzeextensiontheorem Information (Site not responding. Last check: 20071107) 
  The Tietze extension theorem in topology states that, ifX is a normal topological space and 
  The theorem generalizes Urysohn's lemma and is widelyapplicable, since all metric spaces and all compact Hausdorff spaces are normal. 
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 www.anoca.org /map/topology/tietze_extension_theorem.html (139 words) 
