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Consider this simple MWE:

\documentclass{article}
\usepackage[a6paper,showframe]{geometry}
\setlength{\parindent}{0pt}
\begin{document}
Hello world
\end{document}

enter image description here

This is all fine. But if I start the document with an equation, then there is some added vertical space. Does anyone know what is causing this? I'm guessing there is some \vskip command in a .cls file where this is being defined?

\documentclass{article}
\usepackage[a6paper,showframe]{geometry}
\usepackage[fleqn]{mathtools}
\setlength{\mathindent}{0pt}
\begin{document}
\begin{equation*}
\text{Hello world}
\end{equation*}
\end{document}

enter image description here

Milo
  • 9,440
  • Probably related: https://tex.stackexchange.com/questions/36954/spurious-space-above-align-environment-at-top-of-page-minipage – nox Jul 28 '18 at 09:20
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    @nox Thanks, actually I think I've found the answer in https://tex.stackexchange.com/questions/267972/how-to-place-amsmath-equations-at-top-of-page-ignoring-topskip. If I insert \noindent, the vertical space goes away. – Milo Jul 28 '18 at 09:27
  • Still not entirely sure where this vertical space originates from though. And how is it being defined? – Milo Jul 28 '18 at 09:35
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    From my observation, it doesn't make a difference for the positioning of the equation whether you put some text in the first line or skip it and print the equation. Maybe the equation is set in a \vbox that shifts down due to the indentation? – nox Jul 28 '18 at 09:42
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    Informally speaking, without \noindent you get an empty line (10pt high), then 10pt of space (from \abovedisplayskip), then the “Hello world” text; with \noindent the first two are omitted. – GuM Jul 28 '18 at 09:51

0 Answers0