MemberQ

Usage

• 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.

Notes

• 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