![]() In contrast, Sexl Urbantke: "Relativity, Groups, Particles", considers proper time as the "physical interpretation of the spacetime interval ds", and accordingly, they state in chapter 2.6 "Proper time and time dilation" That means that ds has the unit of a space distance. However, there is one problem: Equation 2.4 reads there: With this personal decision, I follow Landau Lifschitz: "The classical theory of fields" (see equations 2.3 and 2.4). This is no question on sign convention, and it is no question if ds or $ds^2$ shall be considered as the spacetime interval: I have taken my personal decision to opt for the signature (+,-,-,-) convention, and to consider ds as the spacetime interval (that means I extract the root of the squared interval $ds^2$). ![]()
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