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- Homework Statement
- Calculate the second-order corrections to energy for the following Hamiltonian matrix.

Use the degenerate perturbation theory. Consider 'b' as perturbation.

- Relevant Equations
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Of course, this question consisted of two parts. In the first part, we needed to calculate the first-order correction. It was easy. In all the books on quantum mechanics I saw, only first-order examples have been solved. So I really do not know how to solve it. Please explain the solution method to me. Thankful