This article is within the scope of WikiProject Mathematics, a collaborative effort to improve the coverage of mathematics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.MathematicsWikipedia:WikiProject MathematicsTemplate:WikiProject Mathematicsmathematics articles
Join of empty set with B should be B but this is not what the definition says. — Preceding unsigned comment added by 73.103.78.132 (talk) 20:24, 26 May 2021 (UTC)Reply
