conformalBlockDegreeM04bar -- computes the degree of a conformal block bundle on $\bar{M}_{0,4}$

This function implements the formula given in [Fakh] Corollary 3.5 for computing the degree of a conformal block vector bundle $V$ on $\bar{M}_{0,4}$.

The first line of the example below shows that the conformal block bundle $V(sl_3,1,(\omega_1,\omega_1,\omega_2,\omega_2))$ has degree 1 on $\bar{M}_{0,4} \cong \mathbb{P}^1$. The second line shows that this vector bundle is a line bundle. Hence, $V(sl_3,1,(\omega_1,\omega_1,\omega_2,\omega_2))$ is isomorphic to $\mathcal{O}(1)$.