Equal


returns True if lhs and rhs are identical.

DetailsDetails

  • is used to represent a symbolic equation, to be manipulated using functions like Solve.
  • returns True if lhs and rhs are ordinary identical expressions.
  • returns False if lhs and rhs are determined to be unequal by comparisons between numbers or other raw data, such as strings.
  • Approximate numbers with machine precision or higher are considered equal if they differ in at most their last seven binary digits (roughly their last two decimal digits).
  • For numbers below machine precision the required tolerance is reduced in proportion to the precision of the numbers.
  • gives True.
  • gives True if all the are equal.
  • Equal[e] gives True.
  • For exact numeric quantities, Equal internally uses numerical approximations to establish inequality. This process can be affected by the setting of the global variable $MaxExtraPrecision.
  • Equal remains unevaluated when lhs or rhs contains objects such as Indeterminate and Overflow.
  • In StandardForm and InputForm, can be input as lhs\[Equal]rhs or .
  • It can also be input as \[LongEqual] or .
  • In TraditionalForm, is output as .
Introduced in 1988
(1.0)
| Updated in 2007
(6.0)