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An approximation based on optimizing trial states, with the Rayleigh–Ritz bound for the ground-state energy.
wp-physics-variational_methodtong-quantumEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
The variational method restricts the state search to a parameterized family and optimizes the energy.
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.
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