🌐EnglishEnglishDeutschEspañolFrançaisItalianoPolskiTürkçeРусский한국어中文日本語EntityQ23691284· pop 12necessary conditioncondition that has to be fulfilled for another statement to holdAvailable in 12 languagesEspañolFrançaisDeutsch中文日本語РусскийEsperantoEstonianGalicianHebrewPolskiConnectionsnecessity and sufficiencyEntity