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Electronic-structure methods derived from an explicit Hamiltonian without fitting the central result to the same target data, while still using finite bases and approximations.
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Ab initio methods form a broad class of electronic-structure calculations distinguished from empirical or semiempirical parametrizations.
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Configuration interaction expands a state in determinants or configuration state functions within a finite one-particle basis.
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Coupled-cluster theory uses an exponential excitation operator and size-extensive truncation hierarchy.
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Hartree–Fock is an ab initio mean-field method and a reference for many correlated wavefunction approaches.
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