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my math equations dosent look very clear, i think they lack a little of bold.

how can i use \mathbf in eqnarray environment ?

more general what do you suggest to make equations very clear and visible ?

  • 2
    You should not use eqnarray, that's outdated. Use align and the related environments. And don't ask more than one question in one post – user31729 Feb 23 '16 at 15:02
  • note that \mathbf does not give you a bold version of the existing equation, it gives upright roman bold (often changing the meaning) to make all math bold use \boldmath before the mathematics – David Carlisle Feb 23 '16 at 15:32
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The following works:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
a &= \mathbf{b}\\
c &= \mathbf{d}
\end{align}
\end{document}

Making equations look nice is a subjective issue (I never use bold unless I am playing with matrices and capital letters). But in any case, avoid eqnarray that has documented problems.

enter image description here

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