# QM Field Guide

List of errors found so far in the *Field Guide to Quantum Mechanics*

- Page 26. The Baker-Campbell-Hausdorff (BCH) formula given at the bottom of the page holds if [A, [A,B]] = 0 and [B, [A,B]] = 0, as is true of the relationship involving functions of operators immediately above the BCH text box. This commutation condition was stated as being necessary for the functions of operators expression, but not also the BCH formula.
- Page 72. The proton gyromagnetic ratio should be listed as being positive 5.586, not negative.
- Page 123, expression [4] at the bottom of the page. This (-1) term in the expansion for sin(x) should be raised to the power of (n+1)/2, not n/2.