Updates:
Status: Accepted
Comment #1 on issue 1315 by ondrej.certik: Lane-Emden equation returns
wrong solution for n=1, and in general is not supported
http://code.google.com/p/sympy/issues/detail?id=1315
Thanks for the bug report. dsolve() failed to determine the type of
equation and it
called a wrong solver.
To fix this, one should first implement a solver for Lane-Emden equation,
or those
types of equations and then dsolve() should be enhanced to determine this
type and
call the solver.
So if you have time, you can send us a solver for Lane-Emden, e.g. accept
the
parameters in the equation and returning the correct solution. Then the
next step
would be to integrate it to dsolve().
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