Basic GR question: For two arbitrary observers measuring same two events, is $ds^2$ numerically the same for both?
10209
How to show the spacetime interval is invariant in general?
85984
How come $\frac{\partial(\partial_{\beta}A_{\gamma})}{\partial(\partial_{\mu}A_{\nu})} = g_{\beta\mu}g_{\gamma\nu}$?
51282
When are two fermions considered identical?
77557
Observed and Observable
67661
Is there an observable of time?
106863
Special relativity and imaginary coefficient of the time coordinate
54717
Is there a model relating GW signal and luminosity of the merger / burst?
91359
Are these mixed partial derivatives equal?
68906
Do the same equations of motion imply the same Lagrangians?
51901
Ambiguity in applying Newton's shell theorem in an infinite homogeneous universe
40501
Why are these two random variables identically distributed?
12267
(Almost) double light speed
123933
Why is causality preserved in special relativity?
83341
How can Planck units be consistent with conflicting dimensions of mass?
88879
Time dilation as an observer in special relativity
103628
Is the canonical parameter (and therefore the canonical link function) for a Gamma not unique?
115295
Why are the two dot product definitions equal?