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 Sep 1 comment Laplacian of $1/r^2$ (context: electromagnetism and poisson equation) Thanks. This is the sort of answer I usually expect when I ask a question at physics.stackexchange. Sometimes an intuitive and short argument can be very enlightening. Aug 27 comment Is this Landau's other critical phenomena mistake? Can we find Landau's argument in Landau & Lifshitz? If so, what volume and page? Thx. Aug 19 comment Numerical computation of the Rayleigh-Lamb curves +1 That's a good idea certainly worth exploring. I'll keep you posted. Aug 19 comment Why isn't there a centre of charge? Just as the center of mass is a location without a mass and so it does not by itself define a potential, the monopole moment of the charge (this is not the same as the monopole term in the power series of the potential) is a charge without a location and by itself it doesn't define a potential. What I'm saying is that the dipole moment of the charge, divided by the total charge, gives a location that is analogous to the location given by the center of mass. Aug 19 comment Why isn't there a centre of charge? I could be wrong, but I'd say that the analogue of center of mass is the dipole moment, not the monopole moment. The monopole moment is the analog of the total mass, but total mass is not the same as center of mass. Just compare the formulas for the center of mass and the dipole moment: they are the same, but with charges instead of masses. Aug 19 accepted Relativistic space-time geometry Aug 19 revised Numerical computation of the Rayleigh-Lamb curves added 345 characters in body Aug 18 comment Complete vs General Integral of first order PDE Landau does refer to Hamilton-Jacobi equations. Can you point me to some other references where the same notions are used relating to Hamilton-Jacobi equations (in classical mechanics)? Perhaps seeing them will clarify me. Aug 18 comment Numerical computation of the Rayleigh-Lamb curves @Alice: The problem is there is more than one root. Blindly bracketing for roots can miss some of them. Aug 18 comment Numerical computation of the Rayleigh-Lamb curves @Timtam: Solving for the eigenvalues analytically is part of the problem Aug 17 revised Complete vs General Integral of first order PDE added tags Aug 17 revised Why is the Ritz combination principle incompatible with Classical Mechanics? corrected title Aug 16 revised Planck's Law in terms of wavelength added 19 characters in body Aug 16 answered Planck's Law in terms of wavelength Aug 16 asked Complete vs General Integral of first order PDE Aug 12 revised added 105 characters in body Aug 12 revised added 138 characters in body Aug 12 suggested approved edit on Aug 12 suggested approved edit on Aug 12 wiki