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## Main Question or Discussion Point

Hi everyone!

There is something that I would like to ask you. Suppose you have

[tex]\frac{1}{\sqrt{-g}} \frac{\delta (\sqrt{-g} (g^{ab} u_a u_b + 1))}{\delta g^{cd}}[/tex]

The outcome of this would be ##u_{c}u_{d}## or ##-u_{c} u_{d}## ?

I am really confused.

There is something that I would like to ask you. Suppose you have

[tex]\frac{1}{\sqrt{-g}} \frac{\delta (\sqrt{-g} (g^{ab} u_a u_b + 1))}{\delta g^{cd}}[/tex]

The outcome of this would be ##u_{c}u_{d}## or ##-u_{c} u_{d}## ?

I am really confused.

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