math-mode
I'm trying to obtain the effect of the \phase command as discribed in the The Comprehensive LaTeX Symbol List (page 70)
I've added the amssymb and pict2e packages correctly (no errors on adding packages), but it keeps saying "Undefined control sequence." when I try to compile.
I'm sure I'm missing something very basic. Is there another package to add? Wich one? Or it just does not work on MacTeX?
It may happen that some vector fonts, albeit regularly installed via MiKTeX Package Manager, are not mentioned in the databases of type 1 fonts (dvips.map and the like) so that MiKTeX tries to make bitmaps fonts.
To circumvent this problem, you should try running updmap.exe from the command line, both as administrator and as user.
Make sure the \abs macro is defined.
\documentclass{article}
\usepackage{mathtools} % for '\DeclarePairedDelimiter' macro
\DeclarePairedDelimiter{\abs}{\lvert}{\rvert} % define '\abs' macro
\begin{document}
$\frac{\abs{\lambda_f}}{8\pi^2}$\quad $\dfrac{\abs{\lambda_f}}{8\pi^2}$
\end{document}
Best Answer
The documentation suggests
\usepackage{steinmetz}