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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