• ← TrueQ
• → UnsameQ

Unequal (≠)

WMA link

Unequal[x, y] or x != y or x ≠ y

is False if x and y are known to be equal, or True if x and y are known to be unequal.

Commutative properties apply so if x != y then y != x.

For any expression x and y, Unequal[x, y] == Not[Equal[x, y]].

• • 1 != 1.

Comparisons can be chained:

• • 1 != 2 != 3

• • 1 != 2 != x

Strings are allowed:

• • Unequal["11", "11"]

Comparison to mismatched types is True:

• • Unequal[11, "11"]

Lists are compared based on their elements:

• • {1} != {2}

• • {1, 2} != {1, 2}

• • {a} != {a}

• • "a" != "b"

• • "a" != "a"

Unequal using an empty parameter or list, or a list with one element is True. This is the same as 'Equal".

• • {Unequal[], Unequal[x], Unequal[1]}