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FreeQ

WMA link

FreeQ[expr, x]

returns True if expr does not contain the expression x.

• • FreeQ[y, x]

• • FreeQ[a+b+c, a+b]

• • FreeQ[{1, 2, a^(a+b)}, Plus]

• • FreeQ[a+b, x_+y_+z_]

• • FreeQ[a+b+c, x_+y_+z_]

• • FreeQ[x_+y_+z_][a+b]