Gδ set (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Gδ set" in English language version.

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1books.google.com

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1kyushu-u.ac.jp

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archive.org

Young, William; Young, Grace Chisholm (1906). Theory of Sets of Points. Cambridge University Press. p. 63.

books.google.com

Stein, Elias M.; Shakarchi, Rami (2009). Real Analysis: Measure Theory, Integration, and Hilbert Spaces. Princeton University Press. p. 23. ISBN 9781400835560.

doi.org

Johnson 1970. Johnson, Roy A. (1970). "A Compact Non-Metrizable Space Such That Every Closed Subset is a G-Delta". The American Mathematical Monthly. 77 (2): 172–176. doi:10.2307/2317335. JSTOR 2317335.

jstor.org

Johnson 1970. Johnson, Roy A. (1970). "A Compact Non-Metrizable Space Such That Every Closed Subset is a G-Delta". The American Mathematical Monthly. 77 (2): 172–176. doi:10.2307/2317335. JSTOR 2317335.

kyushu-u.ac.jp

artsci.kyushu-u.ac.jp

Saito, Shingo. "Properties of G_δ subsets of $\mathbb {R}$ " (PDF).