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These are replies submitted by vitato

singularity??? spherical pendulum has no singularity

I try it in "Wolfram Mathematica" and there is no singularity

@tomleslie equation is correct see here page 3.


@tomleslie  sorry, first system is correct.

{((D@@2)(phi))(t) = -2*(D(phi))(t)*(D(theta))(t)*cos(theta(t))/sin(phi(t)),
            ((D@@2)(theta))(t) = (D(phi))(t)^2*cos(theta(t))*sin(theta(t))-9.8*sin(theta(t))}

see here,  (gape 3.)


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