|ABS_OBS_Contraction (unsigned int nobs, unsigned int nocc1, unsigned int nocc2)|
|nobs = rank of OBS (number of all orbitals), nocc1 and nocc2 are number of occupied orbitals for spaces of electron 1 and 2 |
|ABS_OBS_Contraction (StateIn &)|
|void||save_data_state (StateOut &)|
|Save the base classes (with save_data_state) and the members in the same order that the StateIn CTOR initializes them. |
|double||contract (const double *A, const double *B) const|
|Computes contraction of blocks A and B. |
ABS_OBS_Contraction contracts 2 square nobs-by-nobs blocks for the ABS approach.
Contracts only the occ-occ and vir-vir subblocks of the obs-obs blocks.