Abstract
Problems concerning the extension of continuous functions are central to topology. One is given a space X and a subspace A of X. One is also given a space E and a map f: A → E. The question is: does there exist an extension of f over X, i.e. a map g: X → E such that gA = f?
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James, I.M. (1984). Cofibrations and Fibrations. In: General Topology and Homotopy Theory. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-8283-6_7
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DOI: https://doi.org/10.1007/978-1-4613-8283-6_7
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