I just want to verify that I am calculating the Christoffel symbols for the Levi-Civita connection correctly on the upper half plane $H = \{(u,v) \in \mathbb{R}^2 | v > 0\}$ with the Poincare metric $h = v^{-2}(du^2 + dv^2)$, using the $h$-orthonormal vector fields $E_1 = v\partial_u$ and $E_2 = v\partial_v$. I have the following expression $$ \langle \nabla_{E_i}E_j, E_l \rangle = \frac{1}{2}(E_i\langle E_j, E_l \rangle + E_j \langle E_l, E_i \rangle - E_l \langle E_i, E_j \rangle $$ $$ - \langle E_j, [E_i, E_l] \rangle - \langle E_l, [E_j, E_i] \rangle + \langle E_i, [E_l, E_j] \rangle) $$ which simplifies to $ \Gamma^k_{ij}\langle E_k, E_l \rangle $ where I think that $\langle E_k, E_l \rangle$ is equal to the identity matrix $I_2$, since $E_1$ and $E_2$ are $h$-orthonormal. This yields $$ \Gamma^k_{ij} = \frac{1}{2}I_2^{kl}(E_i\langle E_j, E_l \rangle + E_j \langle E_l, E_i \rangle - E_l \langle E_i, E_j \rangle $$ $$ - \langle E_j, [E_i, E_l] \rangle - \langle E_l, [E_j, E_i] \rangle + \langle E_i, [E_l, E_j] \rangle) $$ Given that $[E_1, E_2] = -v\partial_u = -[E_2, E_1] = v\partial_u$, we can calculate the Christoffel symbols. Here's one to verify that I am calculating correctly: $$\Gamma^2_{11} = \frac{1}{2}I^{2l}(E_1\langle E_1, E_l \rangle + E_1 \langle E_l, E_1 \rangle - E_l\langle E_1, E_1 \rangle - \langle E_1, [E_1, E_l] \rangle - \langle E_l, [E_1, E_1]\rangle + \langle E_1, [E_l, E_1]\rangle) $$ for $l \neq 2$, all terms vanish, and for $l = 2$ the first three terms vanish, leaving $$\Gamma^2_{11} = \frac{1}{2}(-\langle E_1, [E_1, E_2]\rangle - \langle E_2, 0 \rangle + \langle E_1, [E_2, E_1] \rangle) = \frac{1}{2}(\langle E_1, -E_1 \rangle + \langle E_1, E_1 \rangle = 1 $$
If someone could help me verify whether this is correct, that would be appreciated.
