Sorry for late reply. However i had mentioned in my second post as an edit
that 'x' is with assumption 'real=True'.
But i now understand that "operation i suggested" makes the expression
more of complex. Rather than simplifying it.
On Tuesday, May 19, 2015 at 9:36:30 PM UTC+5:30, Aaron Meurer wrote:
>
> x is generally assumed to be complex (not real, so your Piecewise is
> not really correct). Hence it could also be I*oo or -I*oo or even zoo.
> x*oo is the simplest form of this. Plus, it's best to minimize
> automatic simplification, and especially avoid automatic
> "simplification" that actually makes the expression more complex (like
> your Piecewise).
>
> Aaron Meurer
>
> On Sun, May 17, 2015 at 2:13 AM, Gaurav Dhingra <axyd...@gmail.com
> <javascript:>> wrote:
> >>>> from sympy import Symbol, oo, simplify
> >>>> x = Symbol('x', real=True)
> >>>> simplify( x*oo )
> > oo*x
> >
> > Do we use extended real number system(Affinely Extended Real Number
> System)
> > in sympy ?
> > If we do use them, then why not expressions like these "x*oo" evaluated
> to
> > a Piecewise function like
> >>>> Symbol('x')
> >>>> simplify( x*oo )
> > Piecewise( ( -oo, x< 0 ), ( oo, x > 0), (Nan, x==0 )) # i expect
> this
> > to happen.
> >
> > Gaurav Dhingra
> >
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