On Sat, Jan 19, 2008 at 09:01:05PM +0100, Friedrich Hagedorn wrote:
>
> On Thu, Jan 17, 2008 at 03:15:49PM +0100, Ondrej Certik wrote:
> >
> > On Jan 17, 2008 2:50 PM, Friedrich Hagedorn <[EMAIL PROTECTED]> wrote:
> > >
> > > Hello,
> > >
> > > how can do like this:
> > >
> > > x + x**2 == x*(1 + x)
> > >
> > > ?
> >
> > In [1]: factor(x+x**2)
> > Out[1]: x*(1 + x)
>
> Fine. Now I want do
>
> x - y == -1*(y - x)
If you want to check for equality - use expand:
In [1]: lhs, rhs = x+x**2, x*(1+x)
In [2]: lhs == rhs
Out[2]:
2
x + x = x*(1 + x)
In [3]: _.expand()
Out[3]:
2 2
x + x = x + x
In [4]: lhs,rhs = x-y, -1*(y-x)
In [5]: lhs == rhs
Out[5]: x - y = x - y
In [6]: _.expand()
Out[6]: x - y = x - y
Or are you asking how to transform x-y to -1*(y-x) ?
--
Всего хорошего, Кирилл.
http://landau.phys.spbu.ru/~kirr/aiv/
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