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Understanding Perturbation Theory in Quantum Mechanics

Perturbation theory in quantum mechanics is an approximation method used to solve the Schrödinger equation when exact solutions are challenging. It is applicable to both time-independent and time-dependent scenarios, degenerate and non-degenerate states. The theory involves expanding eigenvalues and eigenstates in powers of a small parameter, allowing for the calculation of energy corrections and state vectors. Non-degenerate and degenerate cases are addressed differently, with methods for finding corrections depending on the level of degeneracy present.

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Understanding Perturbation Theory in Quantum Mechanics

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