2c jkbuild combined

Author: brianz98

docs/technical_notes/fock_build.tex

@@ -122,6 +122,7 @@ \section{Exchange matrix algorithm}
 
 The exchange matrix can be computed efficiently as
 \begin{equation}
+\label{eq:exchange}
 \begin{split}
 K_{\mu \nu} &= \sum_{P} \sum_{i}
 \sum_{\sigma \rho} B^{P}_{\mu \sigma} B^{P}_{\rho \nu} C_{\sigma i} C^*_{\rho i} n_i \\