Nowhere dense set which is finitely open

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Nowhere dense set which is finitely open. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 11 (1970), issue 1, pp. 83-89

MSC: 46-10, 46Bxx | MR 0261329 | Zbl 0195.40904

References:

[1] E. HILLE R. S. PHILLIPS: Functional Analysis and Semigroups. Providence 1957.

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