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Hi
I have studied GR form a number of sources - my favorite being Wald - he uses Diffeomorphism Invarience, the rest General Covarience/Invarience. Wald is more mathematically sophisticated but at rock bottom is there really any difference. My suspicion is Wald does it because there is a debate about if General Covarience is correct - it should really be Genenal Invarience - the difference being, for invarience, it also applies to physical content rather than just form.
Thanks
Bill
I have studied GR form a number of sources - my favorite being Wald - he uses Diffeomorphism Invarience, the rest General Covarience/Invarience. Wald is more mathematically sophisticated but at rock bottom is there really any difference. My suspicion is Wald does it because there is a debate about if General Covarience is correct - it should really be Genenal Invarience - the difference being, for invarience, it also applies to physical content rather than just form.
Thanks
Bill