I am trying to display vectors as bold and italic. The command \mathbf sets the letters non-italic. I also googled a bit and stumbled upon \mathbf{\em y} or \mathbfit{y}, which all didn't work.
I hope someone can help me on this.
[Tex/LaTex] Bold italic vectors
bolditalicmath-modevector
Related Solutions
I think using slanted everywhere for monospace italic is OK. Italic typewriter is a distinctly odd concept anyway:-) The substitution in the font shape is as good a way as any to achieve this.
The cleanest way is to define a new math alphabet:
\DeclareMathAlphabet{\mathbfsf}{\encodingdefault}{\sfdefault}{bx}{n}
and then
\newcommand{\tens}[1]{\mathbfsf{#1}}
If you want italic bold sans serif, just change the first declaration into
\DeclareMathAlphabet{\mathbfsf}{\encodingdefault}{\sfdefault}{bx}{sl}
but keep in mind that the OT1 encoded Computer Modern Sans fonts don't have slanted bold face, so also
\usepackage[T1]{fontenc}
or
\usepackage{lmodern}
is required.
You should also consider using \bm of the bm package instead of \boldsymbol, so that \bm{\mathsf{T}} would be equivalent to the \mathbfsf{T} with the first declaration. However there is no predefined sans serif italic math alphabet. So, if you need also sans serif italic, a more economic setting would be
\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{bm}
\DeclareMathAlphabet{\mathsfit}{\encodingdefault}{\sfdefault}{m}{sl}
\SetMathAlphabet{\mathsfit}{bold}{\encodingdefault}{\sfdefault}{bx}{sl}
\newcommand{\tens}[1]{\bm{\mathsfit{#1}}}
\begin{document}
$\tens{T}$
\end{document}
Best Answer
It depends on the math font, but the
bmpackage can handle most of them. The usage is then$\bm{y}$