A Python/PySCF implimentation of the Anti-Hermitian Contracted Schrodinger equation (ACSE)

Solves the ACSE in a spin blocked representation using either the Valdemoro (V) or Nakatsuji-Yasuda (NY) reconstructions of the 3-RDM.

Norms

$$\begin{align} Tr({}^2D_{aa}) &= N_a(N_a-1)/2!\\\ Tr({}^2D_{ab}) &= N_a(N_b)/2! \\\ Tr({}^2D_{bb}) &= N_b(N_b-1)/2!\\\ Tr({}^1D_{a}) &= N_a/1! \\\ Tr({}^1D_{b}) &= N_b/1! \\\ \end{align}$$