This is documentation for Mathematica 7, which was
based on an earlier version of the Wolfram Language.

# FreeQ

 FreeQ[expr, form]yields True if no subexpression in expr matches form, and yields False otherwise. FreeQ[expr, form, levelspec]tests only those parts of expr on levels specified by levelspec.
• form can be a pattern.
• FreeQ uses standard level specifications:
 n levels 1 through n Infinity levels 1 through Infinity {n} level n only {n1,n2} levels n1 through n2
• A positive level n consists of all parts of expr specified by n indices.
• A negative level -n consists of all parts of expr with depth n.
• Level -1 consists of numbers, symbols and other objects that do not have subparts.
• Level 0 corresponds to the whole expression.
• With the default option setting , FreeQ looks at heads of expressions, and their parts.
Test whether a list is free of 0:
FreeQ normally tests all levels in an expression:
Test whether a list is free of 0:
 Out[1]=

FreeQ normally tests all levels in an expression:
 Out[1]=
 Scope   (1)
FreeQ works with patterns:
 Applications   (2)
Define a function that factors out "constants":
Test which integrals are free of logarithms:
New in 1