[Maxima] Equations

[Luigi Marino]

Andrew wrote:

I noticed that solve does not check roots for tolerance range.
A simple example of this is solve([1/x + 1/y =0 , x*y =0],[x,y]);
Maxima gives the solution x=0,
y=0. How to make Maxima check the roots? Maybe some global flags?

Hi .
A possible solution:
declare x and y not equal zero
and Maxima finds  indeterminate system:
x=%*r  and y=-%*r
infact  (x+y)/(xy)=x+y  (eliminate denominator).
2. Try  k=x^2  and solve two equations.

Luigi Marino.
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