Annotate Inkscape figures with LaTeX labels

• Inkscape:
  • annotate math symbols in Inkscape, e. g. $\frac{a}{b}$
  • Save (copy) as: <filename>.pdf
  • Text output options: Omit text in PDF and create LaTeX file
  • uncheck "Rasterize filter effects"
  • Output page size: Use exported object's size
• LaTeX
  • include Inkscape generated <filename>.pdf_tex file:

\documentclass[]{minimal}
\usepackage{graphicx}
\usepackage{color}

\begin{document}


\input{filename.pdf_tex}

\end{document}

• fine tune <filename>.pdf_tex, e. g. sequence of layers (Inkscape exports layers to individual pdf-pages)

\put(0,0){\includegraphics[width=\unitlength,page=1]{filename.pdf}}%
\put(0,0){\includegraphics[width=\unitlength,page=2]{filename.pdf}}%