In practice, if I get a differential equation that I don't recognize
and I want a closed-form solution, I check out
eqworld.ipmnet.ru or one of
the books produced by the same folks. It is like looking up
integrals in an integral table. You look up the form of the equation
you want, then they summarize the solution and cite the proof.

## Ben Trettel said:

In practice, if I get a differential equation that I don't recognize and I want a closed-form solution, I check out eqworld.ipmnet.ru or one of the books produced by the same folks. It is like looking up integrals in an integral table. You look up the form of the equation you want, then they summarize the solution and cite the proof.