Neighbourhood (mathematics) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Neighbourhood (mathematics)" in English language version.

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1books.google.com

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archive.org

Dixmier, Jacques (1984). General Topology. Undergraduate Texts in Mathematics. Translated by Sterling K. Berberian. Springer. p. 6. ISBN 0-387-90972-9. According to this definition, an open neighborhood of $x$ is nothing more than an open subset of $E$ that contains $x.$

books.google.com

Willard 2004, Definition 4.1. Willard, Stephen (2004) [1970]. General Topology. Mineola, N.Y.: Dover Publications. ISBN 978-0-486-43479-7. OCLC 115240.

uh.edu

math.uh.edu

Peters, Charles (2022). "Professor Charles Peters" (PDF). University of Houston Math. Retrieved 3 April 2022.

worldcat.org

search.worldcat.org

Willard 2004, Definition 4.1. Willard, Stephen (2004) [1970]. General Topology. Mineola, N.Y.: Dover Publications. ISBN 978-0-486-43479-7. OCLC 115240.