Spira, Robert Derived-set axioms for topological spaces. (English) Zbl 0181.25501 Port. Math. 26, 165-167 (1967). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Document MSC: 54A05 Topological spaces and generalizations (closure spaces, etc.) Keywords:topology PDFBibTeX XMLCite \textit{R. Spira}, Port. Math. 26, 165--167 (1967; Zbl 0181.25501) Full Text: EuDML