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Extensors and Neighbourhood Extensors

In: General Topology and Homotopy Theory

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  • I. M. James

    (Oxford University, Mathematical Institute)

Abstract

In Chapter 6 the extension problem for mappings has been considered using the notion of cofibration. There is, however, a different approach to the subject which is also important. In this alternative approach the main restriction is placed on the codomain of the mappings in question. In fact it is necessary to restrict the class of domains to some extent as well. For what we are going to do it will be convenient to work with paracompact domains, although some of the results hold more generally for normal domains.

Suggested Citation

  • I. M. James, 1984. "Extensors and Neighbourhood Extensors," Springer Books, in: General Topology and Homotopy Theory, chapter 0, pages 224-243, Springer.
    • Handle: RePEc:spr:sprchp:978-1-4613-8283-6_9
    DOI: 10.1007/978-1-4613-8283-6_9
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