Re: Symbolic derivation, of an unknown function
- From: israel@xxxxxxxxxxx (Robert Israel)
- Date: 17 Jan 2007 05:37:06 GMT
In article <45ad4d26$0$2321$426a74cc@xxxxxxxxxxxx>,
Jérôme Collet <Jerome.Collet@xxxxxxxxxxx> wrote:
I have a problem similar (but much more complicated) to the
following :
I have two functions, I0 and I1 depending of u
I know that :
dI0/du=a
I0+I1=u
I would like my computer algebra system remark that:
dI1/du=1-a
I use Maxima, and I could not get the result. I would like to
know if it
is even possible, or if I would have to switch to another CAS (Axiom,
for example).
In Maple 10:
I1sol:= subs(dsolve({D(I0)(u)=a, I0(u)+I1(u)=u}), I1(u)):D(I1)(u) = diff(I1sol,u);
D(I1)(u) = -a+1
Robert Israel israel@xxxxxxxxxxx
Department of Mathematics http://www.math.ubc.ca/~israel
University of British Columbia Vancouver, BC, Canada
.
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