Hi Roland,
On 21 Jul., 14:54, Rolandb wrote:
> Simon, thanks!
You're welcome!
> But in general there is no (Sage) algoritm to simplify expressions
> given some equalities?
If I remember correctly:
If the equations are not polynomial but anything (e.g. "sin(x)*y=cos
(z)" and so on) then one ca
Simon, thanks!
But in general there is no (Sage) algoritm to simplify expressions
given some equalities?
Rolandb
On 21 jul, 08:05, Simon King wrote:
> Hi Roland,
>
> On 21 Jul., 06:33, Rolandb wrote:
>
> > Hi,
> > How to simplify an expression if you have some known relations
> > (equalitie
Hi Roland,
Would this help?
sage: var ('a b x1 x2 y1 y2')
(a, b, x1, x2, y1, y2)
sage: expression = (a*x1^2 + b*x2^2)*y1 + b*y2^2
sage: expression.subs_expr((a*x1^2 + b*x2^2) == 0)
b*y2^2
Stan
Rolandb wrote:
> Hi,
> How to simplify an expression if you have some known relations
> (equalities)?
Hi Roland,
On 21 Jul., 06:33, Rolandb wrote:
> Hi,
> How to simplify an expression if you have some known relations
> (equalities)? Example:
>
> relation: 0 = a*x1^2 + b*x2^2
> expression = (a*x1^2 + b*x2^2)*y1+b*y2^3
Are all your relations polynomial? Then the standard solution is to
use Gröbn
