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I have a problem with \vec command: instead of the vector symbol it inserts the tilde. I don't see what part of the code is wrong: $$\mathbf{\Gamma(\vec{B}) = \mu_0 I + \frac{d\phi(\vec{E})}{dt}}$$.

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    I don't get any tilde, though your code is strange in many ways (do you really want vectors both bold and with an arrow?) Please provide a short minimal code reproducing the issue, and maybe explain how the equation is supposed to look like.
    – campa
    Jun 15, 2021 at 9:11
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    Welcome to TeX.SE! Please provide complete small document, which reproduce your problem. In my math testbed (used stix fonts doesn't reproduce your problem. BTW, $$ is not LaTeX instruction, rather TeX primitive. Please use \[ and \] instead or \begin{equation*} ... \end{equation}
    – Zarko
    Jun 15, 2021 at 9:16
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    What's the reason for the \mathbf encompassing the whole formula?
    – egreg
    Jun 15, 2021 at 9:29

1 Answer 1

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The reason is \mathbf encompassing the whole formula, which is wrong and makes no sense whatsoever, because it doesn't make the formula bold, but just uses various symbols without a proper meaning.

enter image description here

If you want to make a formula bold for emphasizing it (but you shouldn't), use \bm.

\documentclass{article}
\usepackage{amsmath,bm}

\begin{document}

\[
\bm{\Gamma(\vec{B}) = \mu_0 I + \frac{d\phi(\vec{E})}{dt}}
\]

\end{document}

enter image description here

Note, however, that boldface in math doesn't carry the meaning of emphasis.

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  • Thank you very much, effectively I can remove the boldface. Jun 15, 2021 at 9:39

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