- #1
dEdt
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I've included a pic of a section of Arnold's Mathematical Methods of Classical Mechanics. The relevant passage is: "Since [itex]h_*^s[/itex] preserves [itex]L[/itex], the translation of the solution, [itex]h^s\circ \mathbf{\varphi}:\mathbb{R}\rightarrow M[/itex] also satisfies Lagrange's equation for any s."
Maybe Arnold thought it was too obvious to prove, but for whatever reason I'm having trouble seeing why it's true. I tried proving it with chain rule (I was sure the proof will be a simple cal exercise), but to no avail. It's probably really trivial to prove, but my brain doesn't seem to be working. Could someone help?
Maybe Arnold thought it was too obvious to prove, but for whatever reason I'm having trouble seeing why it's true. I tried proving it with chain rule (I was sure the proof will be a simple cal exercise), but to no avail. It's probably really trivial to prove, but my brain doesn't seem to be working. Could someone help?