2

I want to write out the following equations,

\begin{equation}
  \bf{V} = F(\boldsymbol{\sigma}) + \bf{e}
\end{equation}

\begin{equation}
   \Delta \bf{V} \approx J \cdot \Delta \boldsymbol{\sigma}
\end{equation}

For some reason the F and the second Delta are appearing bold, although I do not want them to be bold. How can I resolve this issue?enter image description hereenter image description here

  • 2
    Welcome to TeX.SE. Advice: the command \bf is depreciated. For modern LaTeX documents you must use \mathbf{...}. – Sebastiano Apr 15 '18 at 21:01
  • 1
    Not only \bf is deprecated: its syntax would be {\bf V}, but \mathbf{V} is the correct form. – egreg Apr 15 '18 at 21:06
  • @Sebastiano Your comment should be an answer. – egreg Apr 15 '18 at 21:07
  • @egreg Thanks a lot for your suggestion. I have add an answer. – Sebastiano Apr 15 '18 at 21:09
  • @egreg YOU ARE ALWAYS AUTHORIZZATED TO EDIT MY QUESTIONS AND ANSWERS. – Sebastiano Apr 15 '18 at 21:15
3

The command \bf is deprecated. Besides it should be {\bf V}, but the correct form is \mathbf{V}.

Also \bm is better than \boldsymbol (requires the bm package).

\documentclass{article}

\usepackage{amsmath}
\usepackage{bm}

\begin{document}


\begin{equation}
  \mathbf{V} = F(\bm{\sigma}) + \mathbf{e}
\end{equation}

\begin{equation}
   \Delta \mathbf{V} \approx J \cdot \Delta \bm{\sigma}
\end{equation}

\end{document}

enter image description here

  • Dear Prof. unfortunately in my profile there is not the motto of the "Barbiere di Siviglia" :-). I'm lent when I think and write. Thank you so much for your cooperation. I do not know what is the unicode symbol of the bow but you keep in mind that there is. – Sebastiano Apr 15 '18 at 21:14

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