changing CD to PD

[David Pirtskhalava]

Hi,

is there a way to change covariant derivatives to partial ones
everywhere in an expression?


thanks,

d

[JMM]

Hi David,

>  is there a way to change covariant derivatives to partial ones
> everywhere in an expression?

Do you mean a brute force replacement like this?

expr /. CD->PD

If the change involves Christoffels then the proper command is of
course ChangeCovD (also accepted with its former name
CovDToChristoffel).

Let me know if I'm misinterpreting your question.

Cheers,
Jose.

[David Pirtskhalava]

Hi Jose,

Yes, I meant just the brute force replacement. I just wanted the
derivatives to commute on the flat background (sometimes it gives
error messages like "Detected metric-incompatible derivatives", but it
still works perfectly). Thank you very much!