DOCUMENTATION CENTER SEARCH
Mathematica >
Built-in Mathematica SymbolTutorials »|See Also »|More About »

Unequal (NotEqual, ≠)

lhsNotEqualrhs or lhs≠rhs
returns False if lhs and rhs are identical.
  • lhs≠rhs 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.
  • e_1≠e_2≠e_3≠… gives True only if none of the ei are equal. 2≠3≠2LongRightArrowFalse.
  • lhs≠rhs represents a symbolic condition that can be generated and manipulated by functions like Reduce and LogicalExpand.
  • 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.
EXAMPLESCLOSE ALL
Basic Examples   (2)
Returns True if elements are guaranteed unequal, and otherwise stays unevaluated:
In[1]:=
Click for copyable input
Out[1]=
 
Enter as NotEqual or as Esc NotEqual Esc:
In[1]:=
Click for copyable input
Out[1]=
New in 1 | Last modified in 3
© 2008 Wolfram Research, Inc.
Ask a question about this page  |  Suggest an improvement  |  Leave a message for the team