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- -- a unary or binary operator, usually used for negation or subtraction
x - y -- a binary operator used for subtraction in many situations
and set difference.
- y -- a unary operator usually used for negation.
See also:
This operator may be used as a binary operator in an expression
like x - y. The user may install binary methods
for handling such expressions with code such as
X - Y := (x,y) -> ...
where X is the class of x and Y is the
class of y.
This operator may be used as a prefix unary operator in an expression
like - y. The user may install a method for handling
such expressions with code such as
- Y := (y) -> ...
where Y is the class of y.
Methods for - :