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There seems to be a term missing in the central equation under Equivalence. I see this article is rarely visited and when it is one is presented with a graduate level analysis of the subject. A time dependent vector field is a fairly simple concept, and a presentation centered, say, on the Euclidean plane or complex plane would be much easier to follow.Oldtimermath (talk) 03:06, 12 July 2022 (UTC)Reply
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