Abstract
Let E be a set, A a subset of E. A cover of A is a family of subsets of E whose union includes A; a subcover of a cover of A is a subfamily which is also a cover of A. If (E, T) is a topological space and A is a subset of E then an open cover of A is a cover in which all the subsets are T-open.
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© 1996 Springer Science+Business Media New York
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Adamson, I.T. (1996). Compactness. In: A General Topology Workbook. Birkhäuser, Boston, MA. https://doi.org/10.1007/978-0-8176-8126-5_6
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DOI: https://doi.org/10.1007/978-0-8176-8126-5_6
Publisher Name: Birkhäuser, Boston, MA
Print ISBN: 978-0-8176-3844-3
Online ISBN: 978-0-8176-8126-5
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