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Unit 21: The Tietze Extension Theorem
21.5 Further Readings Notes
Books J.F. Simmons, Introduction to Topology and Modern Analysis. McGraw Hill
International Book Company, New York 1963.
A.V. Arkhangel’skii, V.I. Ponomarev, Fundamentals of General Topology: Problems
and Exercises, Reidel (1984).
Online links www.mathword. wolfram.com
http://www.answers.com/topic/planetmath
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