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Mathematica > Core Language > Expressions > Testing Expressions > UnsameQ (=!=) >

Mathematica > Core Language > Procedural Programming > Conditionals > Testing Expressions > UnsameQ (=!=) >

BUILT-IN MATHEMATICA SYMBOL

UnsameQ

yields True if the expression lhs is not identical to rhs, and yields False otherwise.

Test whether two expressions are not identically the same:

remains symbolic unless literal values are given:

Full form:

Test whether two expressions are not identically the same:

Out[1]=

Out[2]=

remains symbolic unless literal values are given:

Out[3]=

Full form:

Out[1]=

Test equivalence of strings:

Numbers in different representations are not the same:

nevertheless treats them as equal:

Test whether multiple expressions are all distinct:

Construct the permanent analog of the totally antisymmetric tensor:

1 appears at positions corresponding to permutations: