Update documetation.md

nathanjohnsongithub · Sep 8, 2022 · 87188bd · 87188bd
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@@ -13,6 +13,16 @@ We do on the fly computation of H, so we don't need to store it
 
 1. Split the psi_internal per process.
 2. psi_internal_local compute the sum of PT2 and store the best external determinant.
+
+### Size psi_external: 
+
+- alpha*(virtual-alpha) Single ALPHA
+- beta*(virtual-beta)  Sine Beta 
+- alpha^2*(virtual-alpha)^2 AB doubles 
+- comb(alpha,2)*comb(virtual-alpha,2) AA doubles
+- comb(beta,2)*comb(virtual-beta,2) BB doubles
+
+