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Questions on the numerical functions of Mathematica, implementing numerical methods and numerical computing with Mathematica.

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Numerical solution to Differential equation

I want to get the differential solution numerically. I used wolfram alpha. here is the link. I tried this code on the Mathematica file. sols4 = NDSolve[{x''[ r] + (1/r) x'[r] - (0.5/r^2) Si …
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