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Problems                              129

                        4.11 Using only equation (4.43b) and the fact that ^ a is the adjoint of ^ a, prove that
                                                                   y
                                                  hn9j^ pjniˆÿhnj^ pjn9i
                                                                          3
                        4.12 Derive the relations (4.50) for the matrix elements hn9jx jni.
                                                                          4
                        4.13 Derive the relations (4.51) for the matrix elements hn9jx jni.
                        4.14 Derive the result that the degeneracy of the energy level E n for an isotropic
                            three-dimensional harmonic oscillator is (n ‡ 1)(n ‡ 2)=2.
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