MemberQ

MemberQ[list, form] returns True if an element of list matches form, and False otherwise.

MemberQ[list, form, levelspec] tests all parts of list specified by levelspec.

form can be a pattern.

Example: MemberQ[x^2, y^2, x^_] .

The first argument of MemberQ can have any head, not necessarily List.

MemberQ[list, form] immediately tests whether any expression in list matches form; Element[x, dom] asserts that x is an element of the symbolic domain dom.

See Section 1.8.5 and Section 2.3.5.

See also: FreeQ, Element, Count, Cases, IntervalMemberQ.

New in Version 1.

Further Examples