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14

\relax is a tex primitive command that is non expandable but is defined to do nothing at all, it is useful in several contexts as a delimiter of various sorts. LaTeX always writes one to the start of the aux file for reasons that are not well documented (it does nothing useful) but probably because some file systems had problems with empty, zero length ...

3

Welcome to tex.stackexchange! I added #+LATEX_CLASS: koma-article below the line #+AUTHOR, see this example: #+TITLE: Titel #+SUBTITLE: untertitel #+AUTHOR: wer auch immer #+LATEX_CLASS: koma-article That helped, in a way, because the subtitle gets exported as: \title{Titel\\\medskip \large untertitel} But I failed to find out how to get something like \...

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Another solution, base on \DeclarePairedDelimiterX from mathtools andxparse` for a natural syntax (I mean, close to what one writes by hand): \documentclass{article} \usepackage{amssymb} \usepackage{mathtools} \usepackage{xparse} \DeclarePairedDelimiterX{\Set}[1]\{\}{\setargs{#1}} \NewDocumentCommand{\setargs}{>{\SplitArgument{1}{|}}m} {\setargsaux#...

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Something of this type? \documentclass[a4paper,12pt]{article} \usepackage{amsmath,amssymb} \begin{document} $U=\left\{ (u,v) \;\middle\vert\; \begin{array}{@{}l@{}} u, v\colon \mathbb{R}^d\to[0,\infty) \\ \text{bla bla bla}\\ u+v<7 \end{array} \right\}$ \end{document}

2

Because are designed as internal macros for some package or document class that the final user should not know/use/rewrite. That is, the final user should/could use \firstname in the main.tex but not \@firstname, because @ (at) is then a special character (as &,%, etc.) that cannot be usually used in a control sequence, except whilst you make at a ...

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Rename the file 1907.00284 to 1907.00284.tar.gz and then use a decompression tool of your choice, e.g. 7-zip is very good for windows If you have linux subsystems installed: tar -xzvf 1907.00284.tar.gz

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