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 Nov 27 comment What's the point of hamiltonian mathematical formalism of classical mechanics? @LubošMotl I'm sure you already know that Dimensio1n0 was only 13 when he first joined here, yet was answering questions on the QED Lagrangian! Nov 14 awarded Popular Question Sep 26 comment Meaning of fourth component of velocity four vector He asked about the physical meaning of the fourth component, not the whole vector. Sep 16 awarded Popular Question Sep 3 awarded Notable Question Aug 17 awarded Notable Question Aug 16 comment Why define four-vectors to be quantities that transform only like the position vector transforms? Every frame uses the same Lorentz transformation when transforming events with the same lab space-time coordinates to other frames with the same relative velocity $v$. It's a transformation that doesn't change upon boosting to another frame, making it some kind of "Lorentz invariant". Maybe this isn't appropriate then? Aug 16 comment Why define four-vectors to be quantities that transform only like the position vector transforms? In $Q'=\rho(\Lambda)Q$, must the function $\rho$ be a Lorentz invariant if a physical law exists involving these quantities? Aug 9 accepted What coordinate systems allows the magnitude of the basis vectors to change with position? Aug 7 asked What coordinate systems allows the magnitude of the basis vectors to change with position? Jul 22 comment Is the Maxwell Stress Tensor Coordinate Dependent? What is "the tensor itself"? Jul 13 awarded Yearling Jul 12 asked How does the idea of a scalar potential for a 3-vector field generalize to Minkowski space? Jun 26 comment Intuitive explanation for why centripetal acceleration is $\frac{v^2}{r}$ @OmarNagib the d/dt operator in Mark's explanation acts on a vector, and doesn't care about what it represents, only that it changes direction at a constant angular velocity $\omega$ with a constant magnitude. Perhaps Mark's brilliant explanation could be improved upon if it noted that both the position and velocity vectors rotate at the same angular velocity $\omega= v/r$, and therefore multiplied by this same factor. Jun 9 comment Calculating electric field using a given magnetic field equation (Maxwell-Faraday law) You're right when you say: "I don't think that having the magnetic field merely in the z^ direction, establishes any symmetry in the problem." for reasons given by Lubos in his answer in the link I gave. You should therefore be able to answer your own question in the answers below ;) Jun 9 comment Calculating electric field using a given magnetic field equation (Maxwell-Faraday law) Jun 1 comment Does a photon interfere only with itself? So Dirac was wrong; can you recommend a better QM text book? May 27 revised If time-like paths are geodesics, what physical principle applies to space-like intervals? edited title May 27 asked If time-like paths are geodesics, what physical principle applies to space-like intervals? May 26 awarded Notable Question