General topology (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "General topology" in English language version.

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Merrifield, Richard E.; Simmons, Howard E. (1989). Topological Methods in Chemistry. New York: John Wiley & Sons. pp. 16. ISBN 0-471-83817-9. Retrieved 27 July 2012. Definition. A collection B of subsets of a topological space (X,T) is called a basis for T if every open set can be expressed as a union of members of B.

Moore, E. H.; Smith, H. L. (1922). "A General Theory of Limits". American Journal of Mathematics. 44 (2): 102–121. doi:10.2307/2370388. JSTOR 2370388.

Heine, E. (1872). "Die Elemente der Functionenlehre." Journal für die reine und angewandte Mathematik. 74: 172–188.

Moore, E. H.; Smith, H. L. (1922). "A General Theory of Limits". American Journal of Mathematics. 44 (2): 102–121. doi:10.2307/2370388. JSTOR 2370388.

Armstrong, M. A. (1983). Basic Topology. Springer. p. 30. ISBN 0-387-90839-0. Retrieved 13 June 2013. Suppose we have a topology on a set X, and a collection $\beta$ of open sets such that every open set is a union of members of $\beta$ . Then $\beta$ is called a base for the topology...