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An exponential correlated-wavefunction method with systematic truncations such as singles and doubles, widely used for high-accuracy electronic structure.
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Coupled-cluster theory uses an exponential excitation operator and size-extensive truncation hierarchy.
The target is a member or subtype of the broader source class.
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Coupled-cluster methods use an exponential excitation operator and give systematically improvable, size-extensive approximations within suitable regimes.
The target is a model, idealization, restricted ansatz, approximation scheme, phenomenological fit, or historical representation used for the source system or theory. It need not have a universal small error parameter and is not thereby a controlled limit or effective theory. The edge label and detail must identify the precise status.
wp-chem-quantum-chemistryiupac-green-booknist-chemistry-webbookThis is an authored directed relation from the source endpoint to the target endpoint.
Coupled-cluster theory builds an exponential correlated ansatz, commonly from a Hartree–Fock reference; truncation such as CCSD defines the practical approximation.
A more specific theory, model, entity class, or regime is obtained by restricting or extending the scope of a broader framework.
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