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 Apr 19 asked Is it possible to create a double slit experiment that can predict when photons have 'likely' passed through the slits? Apr 17 asked What's meant by: “All observers agree on the combination of basis vectors and components for a tensor”? Apr 15 awarded Popular Question Apr 10 comment Why glass is transparent? So why does light travel at a different velocity in the vacuum, if it's not absorbed in transparent materials? Apr 10 answered Is there a physical interpretation of a tensor as a vector with additional qualities? Mar 28 awarded Popular Question Mar 19 awarded Popular Question 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?