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 Nov 6 comment Does “sum over all paths” in the path integral imply “sum over all paths” in momentum space when one Fourier-transforms? To your reply to the question in the answer: indeed, I messed up with notation. Still, what you wrote, doesn't address the interpretation. Nov 6 comment Does “sum over all paths” in the path integral imply “sum over all paths” in momentum space when one Fourier-transforms? @Javier The Jacobian you can find it by writing the $\phi(x)$ as the Fourier transform of $\tilde\phi(p)$ and deriving functionally w.r.t. say $\tilde\phi(q)$. You get only $(2\pi)$-factors times a phase factor which cancels out when you take the determinant. Then you get that the Jacobian is a constant, what I wrote. Nov 6 revised Does “sum over all paths” in the path integral imply “sum over all paths” in momentum space when one Fourier-transforms? deleted 51 characters in body Nov 5 asked Does “sum over all paths” in the path integral imply “sum over all paths” in momentum space when one Fourier-transforms? Jun 4 awarded Yearling Nov 11 comment Why is the Poynting Vector Symmetric in E and H? @joshphysics Sorry it took so long to answer. You're right, my answer doesn't address the question: I'm not used to electrodynamics out of vacuum. So I'll erase it. Oct 16 awarded Notable Question Jul 23 awarded Good Question Jul 2 awarded Curious Jun 5 revised Why is the Poynting Vector Symmetric in E and H? added 31 characters in body Jun 5 answered Why is the Poynting Vector Symmetric in E and H? Jun 4 awarded Yearling Jun 3 awarded Nice Question May 18 comment Books to understand what's theoretical physics about Go and talk and interview a theoretical physicist, then a mathematician; compare. Mar 26 revised Relation between solutions to Yang-Baxter equations, integrability and exact solvability? added 119 characters in body Mar 26 asked Relation between solutions to Yang-Baxter equations, integrability and exact solvability? Mar 9 suggested rejected edit on Tensor product of Hadamard operators Mar 9 revised Tensor product of Hadamard operators fine tuning :) Mar 9 suggested approved edit on Tensor product of Hadamard operators Mar 7 revised In what sense is the renormalization group equation a group? added 338 characters in body