Perturbation Theory is a mathematical approximation framework that analyzes complex physical or dynamical systems by treating the effects of a small deviation from an exactly solvable reference problem as a systematic expansion in one or more small parameters.
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Note on an Approximation Treatment for Many-Electron Systems
CHR. KN. MØLLER, M. S. Plesset · Physical Review · 1934 · 14.6K citations
Quantum Mechanics and Path Integrals
Students Quarterly Journal · 1966 · 9.7K citations · Full text
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