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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.
See the Mathematica book: Section 1.8.5, Section 2.3.5.
See also: FreeQ, Count, Cases, IntervalMemberQ.
Further Examples
The symbol a is clearly a member of the indicated list, but {a} is not.
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