On Wed, Apr 1, 2009 at 9:46 AM, mikkelbue <[email protected]> wrote:
>
> Can anyone tell me why this syntax will not work (I keep getting: "Is
> 40*sqrt(10)-x positive, negative, or zero?")?
>
> h=maxima.de_solve('diff(y,x) = -0.05 * sqrt(y)', ['x','y'],[0,10])
> assume(40*sqrt(10)-x>0)
> y=var('y')
> solve(h,y)
>
> Regards, Mikkel
You have to tell *maxima* to make the assumption, not Sage:
h=maxima.de_solve('diff(y,x) = -0.05 * sqrt(y)', ['x','y'],[0,10])
maxima.assume(40*sqrt(10)-x>0)
y=var('y')
solve(h,y)
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