-

x - y -- a binary operator used for subtraction in many situations and set difference.
- y -- a unary operator used for negation.

The user may install binary methods for this operator with code such as 

              X - Y := (x,y) -> ...
where X is the class of x and Y is the class of y.

The user may install a method for this unary operator with code such as 

               - Y := y -> ...
where Y is the class of y.

See also difference and minus.

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