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I recently begun to worry about using \vec on numbers. The arrow is both off-center and slanted, which only works for italics. Is there a simple command to typeset number vectors properly?

$\vec{x}$ % ok
$\vec{0}$ % not ok

example

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Welcome to TeX.SX! You can have a look at our starter guide to familiarize yourself further with our format. It is usually best to post a complete compilable document, in this case that would remove any ambiguity about which fonts you are using. –  Andrew Swann Oct 27 '13 at 9:02

2 Answers 2

up vote 6 down vote accepted

If you are prepared to compile with lualatex then you can use the unicode-math package:

Sample output

\documentclass{article}

\usepackage{unicode-math}

\begin{document}
\( \vec x \)

\( \vec 0 \)
\end{document}

Depending on your text font, in pdflatex you could use the package MnSymbol, this fits with Minion Pro and related fonts.

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Using the package esvect, you get the new command \vv{}, which not only solves your problem of slanted arrow, but can also be used for vectors above multiple letters. The package takes a letter (from a to h) as an option to customize the arrow type.

\documentclass{article}
\usepackage[b]{esvect}
\begin{document}
$\vv{0}$
\end{document}

Preview of the use of the esvect package

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