[Tex/LaTex] Vectors and ClassicThesis (with eulermath)

Question

I use ClassicThesis with the eulermath option. I redefined the standard command for vectors as

\renewcommand{\vec}{\mathbf}

The problem is that that the letter written whit mathbf is completely different to the letter written in eulermath. How can I fix this problem?

This is a MWS:

\documentclass[%
    10pt,%
    a4paper,%
    onside,%
    headinclude,%
    footinclude,%
    BCOR5mm,%
    captions=tableheading]%
        {scrartcl}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}

\usepackage[french]{babel}

\usepackage{amsmath}

\renewcommand{\vec}{\mathbf}

\usepackage[%
    nochapters,%
    beramono,%
    eulermath,%
    pdfspacing,%
    listings]%
        {classicthesis}

\author{Author}
\title{Test}
\date{}

\begin{document}

\maketitle

As you can see, there is a big difference:
\[
   a \neq \vec{a}
\]

\end{document}

Answer 1

The eulermath option loads the eulervm package, which distinguishes the standard \mathbf command from its own command \mathbold which uses Euler Bold.

So the answer is

\renewcommand{\vec}{\mathbold}

If you want a redefinition that's independent of the eulermath option, you can say

\ifthenelse{\boolean{@eulermath}}
  {\renewcommand{\vec}{\mathbold}}
  {\renewcommand{\vec}{\mathbf}}

_{Sorry for the non spaced colon, but I can't stand it. :)}