Hi everyone! again problem with d'inverno's equation!! ok let me see, in chapter 11 section 11.6, it is said that (∂L ̅)/(∂g^ab )=Γ_ac^d Γ_bd^c-Γ_ab^c Γ_cd^d as we see at first if you derive (∂L ̅)/(∂g^ab ) from equation 11.37 you can have the above result. but my professor said it's not true as you should consider that every Γ_ab^c has a g^ab term in it and you should consider that too. as this is simple derivative I think what I did was correct!! can anyone help me with it?