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## Believed to be typos in Desai’s QM Text

Posted by peeterjoot on November 19, 2010

Vatche says that the root cause of what I’ve identified as a typo is in some cases incorrect, and that he’s going through the text carefully himself too.

# Chapter I.

\begin{itemize}
\item Page 7. Text before (1.43). $\alpha$ instead of $a$ used.
\item Page 19. Equation (1.122). $\dagger$s omitted after first equality.
\end{itemize}

# Chapter II.

\begin{itemize}
\item Page 40. Text before (2.137). Reference to equation (2.133) should be (2.135)
\item Page 53. Is the “Also show that” here correct? I get a different answer.
\end{itemize}

# Chapter III.

\begin{itemize}
\item Page 61. Equation (3.51). $1/\hbar$ missing.
\item Page 66. Equation (3.92). $-(d/dt {\langle {\alpha} \rvert}) {\lvert {\alpha} \rangle}$ should be $+{\lvert {\alpha} \rangle} d/dt {\langle {\alpha} \rvert}$.
\item Page 66. Equation (3.93). $H$ on wrong side of ${\langle {\alpha} \rvert}$
\end{itemize}

# Chapter IV.

\begin{itemize}
\item Page 81. Equation (4.52). Should be $-2\alpha$ in the exponent.
\item Page 82. Equation (4.67). $2\alpha$ in the denominator of the normalization should be $\alpha'/\pi$.
\item Page 83. Equation (4.74). A normalized wave function isn’t required for the discussion, but if that was intended, a $1/\sqrt{2\pi}$ factor is missing.
\item Page 86. Equation (4.99). Extra brace in the exponent.
\item Page 87. Equation (4.106). Extra brace in the exponent.
\item Page 89. Equation (4.129), (4.130). $\lambda - m^2/...$ should be $\lambda + ...$
\item Page 93. Equation (4.169). conjugation missing for $Y_{lm}$. $Y_{l'm'}$ is missing prime on the $l$ index.
\item Page 95. Second line of text. Language choice? “We now implement”. perhaps utilize would be better?
\item Page 95. Text before (4.193). $i$ is in bold.
\item Page 96. Text before (4.196). $i$ is in bold.
\item Page 97. (4.205). $i$ is in bold.
\item Page 97. (4.207-209). $\mathbf{i}$, and $\mathbf{j}$s aren’t in bold like $\mathbf{k}$
\item Page 101. (4.239-240). The approach here is unclear. FIXME: incorporate lecture notes from class that did this using braket notation.
\item Page 102. (4.248-249). Commas missing to separate $l$, and $m\pm 1$ in the kets.
\end{itemize}

# Chapter V.

\begin{itemize}
\item Page 113. (5.86). One $\sigma$ isn’t in bold.
\item Page 114. (5.100). $\chi$ is in bold.
\item Page 115. Text before (5.106). $\alpha$ in bold.
\item Page 118. Switch of notation in problem 5 for ensemble averages. $[S_i]$ used instead of $\left\langle{{S_i}}\right\rangle_{\text{av}}$.
\end{itemize}

# Chapter VI.

\begin{itemize}
\item Page 120. $\phi$ in bold. $A$ not in bold.
\item Page 123. (6.26). $1/i \hbar$ factor missing on RHS.
\item Page 124. Text before (6.37). You say canonical momenta $P_k$, but call these mechanical momenta on prev page.
\item Page 125. (6.41). Some $\psi$s are in bold.
\item Page 126. (6.49). There’s no mention that $\mathbf{B}$ is constant, leaving it unclear how the gauge condition and how the curl of $\mathbf{A}$ reproduces $\mathbf{B}$. This would also help clarify how you are able to write $\boldsymbol{\mu} \cdot \mathbf{B} = \mathbf{B} \cdot \boldsymbol{\mu}$.
\item Page 128. (6.65). $\boldsymbol{\mu} \cdot \mathbf{L}$ should be $\boldsymbol{\mu} \cdot \mathbf{B}$.
\item Page 129. (6.75). $\boldsymbol{\mu} \cdot \mathbf{L}$ should be $\boldsymbol{\mu} \cdot \mathbf{B}$.
\end{itemize}