thank you for the reply.
I found this and i guess it is your answer!
The divergence of a given contravariant tensor
results from the expression of the covariant
derivative of that tensor, and due to the contraction,
the divergence will be a tensor of a rank less by two
units.
T^{jk} = \frac{1}{\sqrt{g}}\frac{\partial}{\partial x^{i}} (\sqrt{g}B^{ijk})
Given B^{ijk} is a tensor
Find if T^{jk} is a tensor and explain why and if not what can be done to
B^{ijk} to make T^{jk} a tensor ?
I tried to solve this but i think i'am missing some rules !
I think T^{jk}...