## LaTeX forum ⇒ General ⇒ Double line over math character

LaTeX specific issues not fitting into one of the other forums of this category.
Bozack
Posts: 115
Joined: Wed Feb 06, 2008 4:21 pm

### Double line over math character

Hi

I'm writing a report with a lot of matrices in it - most of the time shortened to simply being written as a single letter. But I'd like to be able to distinct them from other letters (vectors and simple letters with nothing over them) by having a double line over the letter corresponding to a matrix.

I've been looking everywhere, but simply can't figure out how to do this... Can anyone help?
OS, LaTeX-system, editor: Arch Linux 64bit, TeXlive, Kile | Windows 7 Professional 64bit, MikTeX 2.9, TeXnicCenter 2.0 beta 1 64bit

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Stefan Kottwitz
Posts: 9882
Joined: Mon Mar 10, 2008 9:44 pm

### Re: Double line over math character

Hi Bozack,

you could use \bar{\bar{...}} or perhaps \overline{\overline{...}}.

Stefan

localghost
Site Moderator
Posts: 9202
Joined: Fri Feb 02, 2007 12:06 pm

### Double line over math character

If you need such double accented symbols very often in your report, you can use the amsmath package to define these new symbols, optimize accent placement and expedite their output at the same time.
\accentedsymbol{\dbarA}{\Bar{\Bar{A}}

Best regards
Thorsten¹
LaTeX Community Moderator

¹ System: openSUSE 42.2 (Linux 4.4.52), TeX Live 2016 (vanilla), TeXworks 0.6.1

Bozack
Posts: 115
Joined: Wed Feb 06, 2008 4:21 pm

### Re: Double line over math character

Thanks, just what I needed
OS, LaTeX-system, editor: Arch Linux 64bit, TeXlive, Kile | Windows 7 Professional 64bit, MikTeX 2.9, TeXnicCenter 2.0 beta 1 64bit