Empty set (English Wikipedia)

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

Last modified: 06:58:28, 9 September 2026 (UTC)

Ref.Un. Ref.Website

Global rank English rank

22archive.org

6^th place

21wolfram.com

1,091^st place

1,169^th place

11tripod.com

666^th place

543^rd place

11unicode.org

691^st place

581^st place

11classicalrealanalysis.info

low place

11bu.edu

2,348^th place

1,348^th place

archive.org (Global: 6^th place; English: 6^th place)

Rudin, Walter (1976). Principles of Mathematical Analysis (3rd ed.). McGraw-Hill. p. 300. ISBN 007054235X.
David M. Bloom (1979). Linear Algebra and Geometry. pp. 45. ISBN 0521293243.

bu.edu (Global: 2,348^th place; English: 1,348^th place)

math.bu.edu

A. Kanamori, "The Empty Set, the Singleton, and the Ordered Pair", p.275. Bulletin of Symbolic Logic vol. 9, no. 3, (2003). Accessed 21 August 2023.

classicalrealanalysis.info (Global: low place; English: low place)

Bruckner, A.N., Bruckner, J.B., and Thomson, B.S. (2008). Elementary Real Analysis, 2nd edition, p. 9.

tripod.com (Global: 666^th place; English: 543^rd place)

jeff560.tripod.com

"Earliest Uses of Symbols of Set Theory and Logic".

unicode.org (Global: 691^st place; English: 581^st place)

"Unicode Standard 5.2" (PDF).

wolfram.com (Global: 1,091^st place; English: 1,169^th place)

mathworld.wolfram.com

Weisstein, Eric W. "Empty Set". mathworld.wolfram.com. Retrieved 2020-08-11.

Empty set (English Wikipedia)

archive.org (Global: 6th place; English: 6th place)

bu.edu (Global: 2,348th place; English: 1,348th place)