- #1
jorgdv
- 29
- 0
Hello everyone. I understand how to figure out the paths of the free particles following the principle of extremal proper time, but... where does it come from? I mean, how it's derived that particles follow a path of extremal proper time in space-time? I know that for example in flat space-time, the path of extremal proper time is a straight line in space, that agrees with Newton's laws. But how do you generalize that for all space-times?
Thanks
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