Порожня множина (Ukrainian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Порожня множина" in Ukrainian language version.

refsWebsite

Global rank Ukrainian rank

549^th place

1,033^rd place

6^th place

6^th place

311^th place

907^th place

archive.org

Rudin, Walter (1976). Principles of Mathematical Analysis (вид. 3rd). McGraw-Hill. с. 300. ISBN 007054235X.

tripod.com

jeff560.tripod.com

Earliest Uses of Symbols of Set Theory and Logic.

unicode.org

Unicode Standard 5.2