Given a N-dimensional manifold, let gab, be a metric tensor.
Also, just need a clarification on something similar.
I'm pretty sure its yes. Probably even a stupid question but a clarification would be useful.
The Attempt at a Solution
(i)tr g ?
(ii)Here I'm caught between tr g, since I'm thinking its still the tensor and its inverse, and the indices don't matter.
The other option is gac.
Which is correct?