How to use phi(𝜙) symbol in LaTeX?

There is no need to use a package to print the phi symbol in a latex document. You only need to use \phi, the default command of latex.

Symbol/UnicodePhi/U+1D719
Type of symbolGreek small letter
Package (requirement)No
ArgumentNo
Latex command\phi
Example\phi → 𝜙
\documentclass{article}
\begin{document}
   \[ f\;o(\phi) \]
   \[ \phi(1+o(1)) \]
   \[ f \sim \phi \]
\end{document}

Output :

Use phi symbol in latex.

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