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Thanks, David, that does indeed explain it. How hard would
it be to have Sage figure out if the ODE is nonlinear and
return an error instead of a fake solution?
Alex
David Joyner wrote:
| The DE is not linear. The docstring (type ?desolve) says:
| "Solves a 1st or 2nd order linear ODE via maxima. "
|
| On Feb 18, 2008 10:03 PM, Alex Ghitza <[EMAIL PROTECTED]> wrote:
| Hi,
|
| I'm trying the following:
|
| ~ sage: t = var('t')
| ~ sage: x = function('x', t)
| ~ sage: de = lambda y: diff(y,t) - y^4
| ~ sage: desolve(de(x(t)),[x,t])
|
| I get: 't+%c'
|
| But x(t)=t is clearly not a solution of diff(y,t) = y^4. So either I'm
| doing something very silly, or I should report this as a bug.
|
| Best,
| Alex
|
|
|
|
|>
|
- --
Alexandru Ghitza
Assistant Professor
Department of Mathematics
Colby College
Waterville, ME 04901
http://bayes.colby.edu/~ghitza/
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