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 Apr 9 answered Physical intuition/interpretation of fractional derivatives/integrals? Apr 9 comment The derivation of fractional equations Exactly this is indeed done here. Apr 4 comment The unreasonable effectiveness of the partition function I ask this question here. Mar 31 comment What algebraic structure does the collection of all physical quantities form? @Jimmy360: If you type "C* algebra" in the search bar, you get 2675 results. Or try "Lie group", "Lie algbera", etc. Mar 30 awarded Popular Question Mar 28 comment What is the function type of the generalized momentum? Thanks for the answer - is there a reasonable name for the pullback of the momentum function? Mar 28 comment What is the function type of the generalized momentum? @yuggib: My point was that the Poisson bracket is defined as derivatives w.r.t. q and p, and on the rigth side we take such derivatives of q and p. On the left, on the other hand, we need to speak of trajectories. That's why they are odd, without pointing out where we substitute what. Mar 28 comment What is the function type of the generalized momentum? @yuggib: It seems to me that equations stated like ${\dot q}=\{q,H\}$ and ${\dot p}=\{p,H\}$ are completely odd, no matter which of the two perspectives you take. Mar 28 asked What is the function type of the generalized momentum? Mar 26 awarded Good Question Mar 23 comment Which physics quantities are real and which just a tool in the Newtonian apporach? @ShingLau: The problem with "physical meaning means: mathematics with physics reality/something real" is that for every physical quantity in your theory of choice, you will find a theory of fundamental physics where is arises as some composite object, and then it will be easy to argue that it's just a tool. Quantum mechanics defines a force like F=ma as some average, and only late into the theory. Some recent theories will have space and time itself emerges form other quantities. What do you really mean with a question like "what does XXX tell us about reality?" and "physical sense"? Mar 19 awarded Nice Answer Mar 18 revised Derivation of Schrödinger equation - free particle Österreich! Österreich! Österreich! Österreich! Mar 18 suggested approved edit on Derivation of Schrödinger equation - free particle Mar 16 comment Why is light called an 'electromagnetic wave' if it's neither electric nor magnetic? Coming back to this answer which I gave 3 years ago, I feel it's a bit cryptic. The gist of my thinking is that I don't think peoples questions, if formulated in a misguided (inherently confusing) conception of physics, math and language, should maybe not be answered in their own terms. This just reinforces their ideas and turns them into people who themselves give non-explanatory explanations (answers that just move the question around). Mar 12 comment Kerr metric Christoffel symbols @ChrisWhite: But it's easier than doing the same thing by hand. Mar 12 comment Kerr metric Christoffel symbols Nice. In a similar spirit (on the Robertson-Walker kind of metrics in different coordinates), I found this and this reference very helpful. Mar 12 revised Kerr metric Christoffel symbols deleted 4 characters in body Mar 12 revised Kerr metric Christoffel symbols added 77 characters in body Mar 12 answered Kerr metric Christoffel symbols