Two quantities are said to be different (or "unequal") if they are not equal.
The term "different" also has a technical usage related to modules. Let a module 
in an integral domain 
for 
be expressed using a two-element basis as
![M=[xi_1,xi_2],](/images/equations/Different/NumberedEquation1.svg) |
where 
and 
are in 
. Then the different of the module
is defined as
 |
The different 
iff 
and 
are linearly independent. The module discriminant is defined as the square
of the different.
