EntityQ7249440· pop 7· linked from 30 articlesprojectionSign in to savean operation in set theory that maps elements in a set to elements from another setConnectionsInternational Standard Book NumberEntityset theoryEntityfunctionEntityCartesian productEntityequivalence relationEntitysurjective functionEntityPaul HalmosEntityequivalence classEntityprojectionEntityprojectionEntityUndergraduate Texts in MathematicsEntityrelation (mathematics)EntityprojectionEntityCategoriesBasic concepts in set theory