Home›Axioms of set theory›axiom of union🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaРусскийفارسی中文日本語EntityQ1987722· pop 19· linked from 129 articlesaxiom of unionaxiom stating that for any set x there is a set y whose elements are precisely the elements of the elements of xAvailable in 19 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoCatalanCroatianGreekConnectionsset theoryEntitysubsetEntityCategoriesAxioms of set theory