A superior manual does not just write:
The pinnacle of solutions manuals includes brief "Why this works" sidebars. For instance, when solving the harmonic oscillator via ladder operators, the best manual doesn't just write ( a|n\rangle = \sqrtn|n-1\rangle ); it explains why the ground state must satisfy ( a|0\rangle = 0 ). quantum physics stephen gasiorowicz solutions manual best
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