factor over complex numbers?



Sorry for the noise. I made a stupid error when preparing my post
yesterday.
Milan

* Edwin Woollett <woollett at charter.net> [2008-01-27 13:01:45 -0800]:

> Hi Milan,
> 
> >> Is there any option I can set to get factor(expr1) -> (-%i + x)^5  (%i +
> >> x)^5
> >> instead of getting (1 + x^2)^5 ?
> >>
> 
> >factor(expr1,x^2+1);
> 
> >Milan
> 
> I get factor(expr1,x^2+1);  --> 0
> 
> ted
> -----------------
> (%i1) display2d:false$
> (%i2) expr1 : expand( (1+x^2)^5 );
> (%o2) x^10+5*x^8+10*x^6+10*x^4+5*x^2+1
> 
> (%i3) factor( expr1 );
> (%o3) (x^2+1)^5
> 
> (%i4) gfactor( expr1 );
> (%o4) (x-%i)^5*(x+%i)^5
> 
> (%i5) factor( expr1, x^2 + 1 );
> (%o5) 0
> --------------------
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