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The code provided does not result in the error shown.
And why should it? A - in the text is just a hyphen, not a minus sign...
You seem to be doing something else than shown.

KR
Rainer

Well, \node[anchor=north] (box) at (current page.north) {..}; creates a node called `box' at pgf/tikz special node `current page' to the north. In other words, the new `box' node is to be created at the top of the (current) page. To prevent the contents of this new node from spilling...

AFAIUI, Xindy offers two variants for Dutch spelling, where `ij' is sorted differently---as `ij' or as `y'. Simply prepend the variant you want to `utf8' in your codepage statement, such as \usepackage[automake,xindy={language=dutch,codepage=ij-as-y-utf8}]{glossaries} then Xindy should load Loading ...

The sidebar is generated but it’s all squished on the bottom side of the page (if I use the X parameter). You're limiting the `width' of your tabularx to \textwidth . Then you have raised \tabcolsep to 1 cm, which is inserted `left' and `right' of each of the three columns, that leaves \textwidth -...

Come to think of it,

would be even easier.

KR
Rainer

I guess that's just it---an H column is not specified. If I had to create one, I'd do s.th. like \documentclass{article} \usepackage{array} \newsavebox\dummy \newcolumntype{H}{>{\begin{lrbox}{\dummy}}c<{\end{lrbox}}@{}} \begin{document} \raggedright \begin{tabular}{rl} one & two\\ three & fo...

Hi,
each \left command must be accompanied by a matching \right command within the same line (and group).
Use \right. just before the & sign of the first line and
\left. at the beginning of the second line.

KR
Rainer

Isn't `deleting part of the source' a function of the text editor you're using?
Or are you after something to `keep in .tex file, but strip from .pdf'? That should be doable by

which should work for all TeX engines.

KR

Rainer

Well, instead of a single \parbox inside the \rotatebox , you could use 3 smaller ones: {\rotatebox{90}{% \parbox{10cm}{% \raggedleft\textcolor{black}{\bfseries\scshape\thechapter.\leftmark}% }% \hspace{2cm}% \parbox{4cm}{\centering\color{red!70!black} company name}% \hspace{2cm}% \parbox{10cm}{\rag...

perhaps \vphantom is what you're really after: \documentclass[11pt,letterpaper,twoside]{book} \usepackage{lmodern} \usepackage{amsmath} %\setlength{\jot}{\baselineskip} \newcommand*\bigstrut{\vphantom{\frac{A^2}{y^2}}} \begin{document} Blabla: \begin{gather} \bigstrut x^2 - \frac{1}{2} \, x = 3, \\ ...