Le 28 juin 04, à 04:38, Richard Seguin a écrit :
However, using Fourier, $\mathbf{T}$ is bold, but is upright, and
$\boldsymbol{T}$ is not bold, but is italic.
This is normal behaviour. \mathbf allows to use the text bold font in
maths, in other words it produces in maths the same output as does
\textbf in text; hence the upright result.
\boldsymbol, from the amsbsy package (deprecated in favour of bm), and
\bm, from the bm package, do something different: they select bold
maths fonts, provided these fonts are available. In other words they
take the (italic) math symbol you are asking for, look for a bold
version of it, and, if it's available, pick it up; if it's not, they
apparently revert to the non-bold version. Both \boldsymbol and \bm aim
at providing more practical and extensive variants of LaTeX's original
\boldmath.
Bruno Voisin
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