= Perturbation theory (quantum mechanics)
{wiki=Perturbation_theory_(quantum_mechanics)}
Perturbation theory in quantum mechanics is a mathematical method used to find an approximate solution to a problem that cannot be solved exactly. It is particularly useful when the Hamiltonian (the total energy operator) of a quantum system can be expressed as the sum of a solvable part and a "perturbing" part that represents a small deviation from that solvable system. \#\#\# Key Concepts 1.
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