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Author about a warning "command \b (bar-under) invalid in math mode"
cattug@gmail.com

2005-08-29, 7:04 pm

hi, i'm preparing a document using latex and using "bar-under"(\b)
command in some equations, and warnings like "command \b invalid in
math mode" appear when i compiled the tex file. how can i eliminate
this warnings?

thanks, tugrul.

G. A. Edgar

2005-08-29, 7:04 pm

In article <1125336659.916080.135120@g49g2000cwa.googlegroups.com>,
<"cattug@gmail.com"> wrote:

> hi, i'm preparing a document using latex and using "bar-under"(\b)
> command in some equations, and warnings like "command \b invalid in
> math mode" appear when i compiled the tex file. how can i eliminate
> this warnings?
>
> thanks, tugrul.
>


in math mode, you can use \underline{}

--
G. A. Edgar http://www.math.ohio-state.edu/~edgar/
Enrico Gregorio

2005-08-29, 7:04 pm

<"cattug@gmail.com"> wrote:

> hi, i'm preparing a document using latex and using "bar-under"(\b)
> command in some equations, and warnings like "command \b invalid in
> math mode" appear when i compiled the tex file. how can i eliminate
> this warnings?


By using the correct construction: $\underline{a}$. If you use \b
you get not only a warning, but also the letter in a wrong typeface.

Ciao
Enrico
cattug@gmail.com

2005-08-30, 7:58 am

i prefered not to use bar under letters. i wanted to use bar under
letters to specify vectors and decide to use \mathbf command to do it.

thanks for replies.

tugrul.

Lars Madsen

2005-08-30, 7:58 am

cattug@gmail.com wrote:
> i prefered not to use bar under letters. i wanted to use bar under
> letters to specify vectors and decide to use \mathbf command to do it.
>
> thanks for replies.
>
> tugrul.
>


\bm (from the bm package) might be a better choice

then $\bm{x}$ will just be a bold version of $x$, whereas $\mathbf{x}$ is an
upright bold x.

--

/daleif (remove RTFSIGNATURE from email address)

LaTeX FAQ: http://www.tex.ac.uk/faq
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LaTeX book: http://www.imf.au.dk/system/latex/bog/ (in Danish)
Remember to post minimal working examples.
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