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Jun 8 at 19:00 comment added KP99 you can use metric even in the classical non-relativistic case. So the expression you have is really for mass=1
Jun 8 at 18:30 history edited pll04 CC BY-SA 4.0
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Jun 8 at 11:08 comment added Jeanbaptiste Roux Well, the action for a massive point particle is $m \int_{\tau_1}^{\tau_2}ds$...
Jun 8 at 10:39 history edited Qmechanic CC BY-SA 4.0
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Jun 8 at 10:22 history asked pll04 CC BY-SA 4.0