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This question already has an answer here:

How does one create the symbol for EMF (electromotive force) used in physics for a LaTeX document? It is like \varepsilon but uppercased.

marked as duplicate by Jesse, Malipivo, Werner, Andrew, jub0bs Apr 20 '15 at 6:39

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    Welcome to TeX.SX! You can have a look at our starter guide to familiarize yourself further with our format. – user11232 Apr 20 '15 at 1:37
  • @hftf I'm not sure this really should be a duplicate, because the symbol used for EMF is \mathcal{E} (I've written it many times, I know), but the other question's poster specifically says that is not the symbol they're looking for. – David Z Apr 20 '15 at 5:50
  • @DavidZ I've never seen it written \mathcal{E}. – hftf Apr 20 '15 at 6:22
  • @hftf well, now you have, or at least you know someone who has. ;-) I guess there must be some variation between sources, but pretty much every time I remember seeing it, the symbol seems like an exact match to the calligraphic E. – David Z Apr 20 '15 at 10:46
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Is this close enough?

\documentclass{article}
\usepackage{amsmath}

\begin{document}
    \[\mathcal{E} \varepsilon \]
\end{document}

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