On 2012-11-29, Leslaw Bieniasz wrote:

> By using the terminology of MS Word/Windows, I need the following
> combinations:

> 1) Italic
> 2) Bold
> 3) Italic+Bold

> I have been able to have 1 in Lyx (this in fact appears by default
> while typing the formulae). I have also been able to have 2, which
> can be done if I change the font to /mathbf in the equation editor.
> But I have not been able to achieve 3. Is there any way to do this?
> The point is that I'd like to see these effects not only in LyX itself,
> but also (or maybe in the first place) in the pdf file generated by LyX.

I recommend using the LaTeX package "isomath"
(http://www.ctan.org/pkg/isomath):

Insert "\usepackage{isomath}" in Document>Settings>LaTeX Preamble,
then you can use the macros:

> 1) Italic
     $ a - \omega$ $   % italic is the default in math-mode
> 2) Bold
     $ \mathbf{a} - \mathbf{\omega}} $ % upright bold
> 3) Italic+Bold
     $ \mathbfit{a} - \mathbfit{\omega}}
 
or use semantic markup:
 
 The following commands set the argument in an ISO-conforming math alphabet:

    \vectorsym, \matrixsym  bold italic for Greek and Latin letters,
                            bold upright for numbers


See also the full documentation at
http://mirror.ctan.org/macros/latex/contrib/isomath/isomath.html

Optionally redefine the standard vector macro \vec:

  \renewcommand{\vec}{\vectorsym}

You can also make this a math-macro, to have a matching look in LyX.

Günter

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