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{{Built-in|Membership|∊}}, also called '''Member Of''' or '''Member In''', is a [[dyadic]] [[primitive function]] which tests if each of the elements of the left [[argument]] appears as an element of the right argument. Membership | {{Built-in|Membership|∊}}, also called '''Member Of''' or '''Member In''', is a [[dyadic]] [[primitive function]] which tests if each of the elements of the left [[argument]] appears as an element of the right argument. Membership derives from the traditional mathematical notation <math>\in</math> (''Element of'') and therefore uses that [[glyph]] (lunate epsilon). | ||
== Examples == | == Examples == | ||