openfermion.linalg.singlet_erpa

Generate the singlet ERPA equations

[ea + eb, [H, sa, sb]] = [ea, [H, sa]]

The erpa equations are solved with scipy.linalg.eig which calls lapack's geev

tpdm 2-RDM tensor normal OpenFermion format
h_ijkl reduced Hamiltonian tensor

Tuple of the erpa system.