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Non-linear Diff. Equations on MMA ?


Hi MMA-Users,

I am wondering if it is possible to solve non-linear differential
equations with MMA. I tried to DSolve one like y''(x)=a* y(x)^3, which
leads to elliptic  integrals- MMA says that it cannot handle it with the
built-in roules. Are they maybe any packages, notebooks available ?- I am
a MMA-newbie, so do not hesitate to give me simple answers or to tell me
well-known places. btw: could anybody tell me some good sites to pick
MMA-packages,-notebooks?

Thanks a lot ;-)
David



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