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)? Example:
>
> relation: 0 = a*x1^2 + b*x2^2
> expression = (a*x1^2 + b*x2^2)*y1+b*y2^3
>
> Given the relation, the expression could be simplified to b*y2^2. But
> how in Sage?
> Tnx in advance. Rolandb
>
> >
>
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