Icons

$\DeclareMathOperator{\homop}{Hom} \newcommand{\Hom}[2]{\homop\left(#1,\,#2\right)} \newcommand{\lt}{<} \newcommand{\gt}{>} \newcommand{\amp}{&} \definecolor{fillinmathshade}{gray}{0.9} \newcommand{\fillinmath}[1]{\mathchoice{\colorbox{fillinmathshade}{$\displaystyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\textstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptscriptstyle\phantom{\,#1\,}$}}} $

Section 30.14 Icons

The <icon> element is built around the Font Awesome 5 font collection. The LaTeX fontawesome5 package contains all the necessary font files (for use with both pdflatex and xelatex), and a style file that interfaces, in a semi-elaborate way, with the font files. If you have installed this LaTeX package, and the fonts still seem unavailable, figure out how to adjust your LaTeX setup or your system configuration. Simply installing a font file, such as the more recent Font Awesome 5 is not going to work. See Chapter 40 for more about fonts in LaTeX.

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