buch/papers/kugel/figures/povray/curvature.maxima


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f: exp(-r^2/sigma^2)/sigma;
laplacef: ratsimp(diff(r * diff(f,r), r) / r);
f: exp(-r^2/(2*sigma^2))/(sqrt(2)*sigma);
laplacef: ratsimp(diff(r * diff(f,r), r) / r);