How to use small epsilon(ε) symbol in LaTeX?

Symbol/UnicodeVarepsilon/U+03F5
Type of symbolGreek small letter
Package (requirement)No
ArgumentNo
Latex command\varepsilon
Example\varepsilon → ε

You need to use the default command \varepsilon to print the small epsilon symbol in a latex document.

\documentclass{article}
\begin{document}
   \[ B(y_0 ,\;\varepsilon) \]
   \[ \sqrt{-\varepsilon + 4} < \sqrt{\varepsilon + 4} \]
   \[ \mid x^2 - 1 \mid < \varepsilon \]
\end{document}

Output :

Use varepsilon in latex.

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