Can someone please give me an example of a symbolic expression in sage of the subtraction variety? (by subtraction variety I mean using the subtraction operator)
Precisely: how can I create an object o of type sage.symbolic.expression.Expression such that o.operator() is operator.sub? It seems that subtraction expressions are always converted to additions.
For example:
sage: x = var('x')
sage: (x-1).operator()
<built-in function add>
