Ab Initio versions are incredibly efficient. They strip away the aimless meandering of standard classes. You aren't spending six weeks learning colors; you are learning sentence structures, thematic vocabulary, and survival skills immediately.
The Hartree-Fock method is a self-consistent field (SCF) approach that assumes that the wavefunction of the system can be approximated as a single Slater determinant. Post-Hartree-Fock methods improve upon the Hartree-Fock method by including electron correlations through perturbation theory or configuration interaction. DFT, on the other hand, is a method that uses the electron density to describe the system, rather than the wavefunction. ab initio versions
Ab initio methods are based on the Schrödinger equation, which describes the time-evolution of a quantum system. The Schrödinger equation is a partial differential equation that can be solved exactly for simple systems, but for complex systems, approximate solutions must be sought. Ab initio methods use a variety of techniques, such as the Hartree-Fock method, post-Hartree-Fock methods (e.g., MP2, CI, CCSD(T)), and density functional theory (DFT), to solve the Schrödinger equation. Ab Initio versions are incredibly efficient