How to use epsilon(ϵ,ε) and backepsilon(϶) symbol in LaTeX?

Symbol/UnicodeEpsilon/U+03B5
Type of symbolGreek letter
Package (requirement)No
ArgumentNo
Latex command\epsilon
Example\epsilon → ϵ

The Greek letter Epsilon is a popular symbol of Mathematica. You need to use the \epsilon command to write this symbol in latex. Below is how to use it in latex.

\documentclass{article}
\begin{document}
   \[ \lim_{\epsilon\rightarrow 0^+} \frac{1}{\epsilon^2 N(\epsilon)} \]
   \[ p < \epsilon \]
   \[ \lim_{\epsilon\rightarrow 0} \frac{1}{\pi x}\sin\left(\frac{x}{\epsilon}\right) \]
\end{document}

Output :

Use epsilon symbol in latex.

Varepsilon symbol in LaTeX

SymbolVarepsilon
Type of symbolMathematics
Package (requirement)No
ArgumentNo
Latex command\varepsilon
Example\varepsilon 🠒 ε

LaTeX provides a default command to print the varepsilon symbol in a LaTeX document, which is \varepsilon. And if you want to print this symbol in upper case then use \mathcal{E} command. You don’t need any package for this.

\documentclass{article}
\begin{document}
  \[ \verb|\epsilon|\longrightarrow \epsilon \]
  \[ \verb|\varepsilon|\longrightarrow \varepsilon \]
  \[ \verb|\mathcal{E}|\longrightarrow \mathcal{E} \]
\end{document}

Output :

Use varepsilon in latex.

Backepsilon symbol in LaTeX

You will need the amssymb package to print backepsilon symbols to a LaTeX document. This package provides a command called \backepsilon, which allows you to print this symbol in a document.

Symbol/UnicodeBackepsilon/U+03F6
Type of symbolMathematics
Package (requirement)amssymb
ArgumentNo
Latex command\backepsilon
Example\backepsilon 🠒 ϶
\documentclass{article}
\usepackage{amssymb}
\begin{document}
  \[ \verb|\epsilon|\longrightarrow \epsilon \]
  \[ \verb|\backepsilon|\longrightarrow \backepsilon \]
\end{document}

Output :

Use backepsilon symbol in latex.

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