Variational principle (energy)

Layer 2 — Chemistryin the chemical-physics subtree

Rayleigh-Ritz 1909: <psi|H|psi>/<psi|psi> >= E_0 for any trial psi; basis of Hartree-Fock + DFT + variational quantum eigensolver; equality iff psi proportional to ground-state.

Related concepts

Linear ODE
Boltzmann entropy formula

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