(48G 49G 50G) Runge-Kutta Diff Eqn solver

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Perfect!

Thank you, Werner.

"Store the program in the reserved variable EQ, fire up the num. solver, diff eq.
The program is shown as 'F'," This is the important part that should be included in the 50G documents. It allows the solution of 2nd order nonlinear ODE's. A very important class.

Thanks, also, to Eric Rechlin who sent me to this forum.

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