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Dec
5
comment observable quantities are gauge invariant?
@twistor59 thanks for you advise :)
Dec
3
comment observable quantities are gauge invariant?
@twistor59 Thanks for your comments, Now the question is that In what sense,"observable quantity is gauge invariant" is correct?
Dec
3
comment observable quantities are gauge invariant?
@LuboŇ°Motl Thanks for you comment. Basically I am working on GR so the coordinate system can be chosen freely under arbitrary diffeomorphisms of spacetime.