[Tex/LaTex] How to write two dot above a letter

accentsmath-mode

the two dots above a letter represents two derivative of varible t.

My method:

\documentclass[UTF8]{ctexart}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{epstopdf}
\usepackage{inputenc}
\begin{equation}
\"{o}
\mathaccent{o} 
\end{equation}

However,the latex says in the math environment ,I must use the \mathaccent. So I replace \" by \mathaccent, but it shows the warning information: Missing number, treated as zero

I am a starter, I want to know how to revise it? Can someone help me? Thanks sincerely!!

Best Answer

The sequence

\"{o}

will be used when you want to write 'ö' in text, such as 'Schrödinger'. While in the math mode, as Peter Grill mentioned

\dot{o}
\ddot{o}

and so on, should do the trick.

Edit:

For more than two dots, e.g. \dddot{o}, you need the package amsmath, which allows you a maximum of 4 dots \ddddot{o} (not strikingly beautiful )

For higher dot derivatives take a look at this post

Related Solutions

[Tex/LaTex] How to write properly math accent for letter i

$\acute{\imath}$ is the right way. What do you mean by "not always works satisfactorily"?

In general, \imath and its companion \jmath should be used for the math accents:

\acute{\imath}
\grave{\imath}
\dot{\imath} (ambiguous!)
\ddot{\imath}

and so on.

\documentclass{article}

\usepackage{inputenc}
\usepackage{amsmath} % tex.stackexchange.com/questions/69373/#comment148505_69374

\begin{document}
  $\imath$ $\acute{\imath}$ $\acute{i}$ $\grave{\imath}$ $\dot{\imath}$ $i$ $\ddot{\imath}$
  
  $\jmath$ $\acute{\jmath}$ $\acute{j}$ $\grave{\jmath}$ $\dot{\jmath}$ $j$ $\ddot{\jmath}$
  
  $X_{\mathrm{s\acute\imath}}$ $X_{\textup{s\'i}}$ $X_{\textup{sí}}$
\end{document}

[Tex/LaTex] accent above a greek letter

Use \acute{} in mathmode:

$\acute{\omega}$

Other accents in mathmode:

\documentclass{article}
\renewcommand{\arraystretch}{1.5}

\begin{document}

\section*{Accents in mathmode}
    $\begin{array}{llll}
        \underline{\omega} & \verb|\underline{\omega}| &
        \overline{\omega} & \verb|\overline{\omega}| \\
        \hat{\omega} & \verb|\hat{\omega}| &
        \check{\omega} & \verb|\check{\omega}| \\
        \tilde{\omega} & \verb|\tilde{\omega}| &
        \acute{\omega} & \verb|\acute{\omega}| \\
        \grave{\omega} & \verb|\grave{\omega}| &
        \dot{\omega} & \verb|\dot{\omega}| \\
        \ddot{\omega} & \verb|\ddot{\omega}| &
        \breve{\omega} & \verb|\breve{\omega}| \\
        \bar{\omega} & \verb|\bar{\omega}| &
        \vec{\omega} & \verb|\vec{\omega}| \\
    \end{array}$
\end{document}

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Best Answer

Related Solutions

[Tex/LaTex] How to write properly math accent for letter i

[Tex/LaTex] accent above a greek letter

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