returns False if lhs and rhs are identical.


  • can be entered as x\[NotEqual]y or Esc!=Esc .
  • returns True if lhs and rhs are determined to be unequal by comparisons between numbers or other raw data, such as strings.
  • Approximate numbers are considered unequal if they differ beyond their last two decimal digits.
  • gives True only if none of the are equal. 2≠3≠2->False.
  • represents a symbolic condition that can be generated and manipulated by functions like Reduce and LogicalExpand.
  • Unequal[e] gives True.
  • 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.
  • In StandardForm, Unequal is printed using .
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