Recent content by ooleonardoo

gasiorowicz, zettili , griffiths The level of the book you mentioned is high for me. Do you know of any other book that explains this with an example?

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...