This is documentation for Mathematica 4, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.1)

Equal (==)SameQ (===)

Unequal

FilledSmallSquarelhs != rhs or lhs rhs returns False if lhs and rhs are identical.

FilledSmallSquarex y can be entered as x \[NotEqual] y or x AliasIndicator!=AliasIndicator y.

FilledSmallSquarelhs rhs returns True if lhs and rhs are determined to be unequal by comparisons between numbers or other raw data, such as strings.

FilledSmallSquare Approximate numbers are considered unequal if they differ beyond their last two decimal digits.

FilledSmallSquare ... gives True only if none of the are equal. 2 3 2 LongRightArrow.

FilledSmallSquarelhs rhs represents a symbolic condition that can be generated and manipulated by functions like Reduce and LogicalExpand.

FilledSmallSquareUnequal[e] gives True.

FilledSmallSquare For exact numeric quantities, Unequal internally uses numerical approximations to establish inequality. This process can be affected by the setting of the global variable $MaxExtraPrecision.

FilledSmallSquare In StandardForm, Unequal is printed using .

FilledSmallSquare See The Mathematica Book: Section 1.5.6.

FilledSmallSquare See also: Equal, UnsameQ, Order.

Further Examples

Equal (==)SameQ (===)