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| Paritosh, thank you very much. You probably use Mathematica 9 that's why it didn't work with the plot. But I plot it this way.[mcode]R = 1 + 10^-15; eqns = (2 (1 - (r/R)^2)) D[rho[r, z], z] == (r D[rho[r, z], r, r] + D[rho[r, z], r])/r; bcs =... |