🌐EnglishEnglishEspañolPolskiTürkçeالعربيةไทย中文EntityQ7212729· pop 10· linked from 6 articlesvertical line testmathematical conceptAvailable in 10 languagesEspañol中文العربيةHebrewPolskiTamilTürkçeUrduไทยConnectionsInternational Standard Book NumberEntityfunctionEntityCategoriesFunctions and mappings