Introduction to Quantum Mechanics · Problem A.9

Afterword — David J. Griffiths

Physics — Quantum Mechanics · matrices

Problem

Using the square matrices in Problem A.8, and the column matrices a=(i2i2),b=(2(1−i)0),\mathsf{a} = \begin{pmatrix} i \\ 2i \\ 2 \end{pmatrix}, \quad \mathsf{b} = \begin{pmatrix} 2 \\ (1-i) \\ 0 \end{pmatrix}, find: (a) Aa\mathsf{A}\mathsf{a}, (b) a†b\mathsf{a}^\dagger \mathsf{b}, (c) a~Bb\tilde{\mathsf{a}}\mathsf{B}\mathsf{b}, (d) a b†\mathsf{a}\,\mathsf{b}^\dagger.

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