Phi(πœ™) 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/Unicode Phi/U+1D719
Type of symbol Greek small letter
Package (requirement) No
Argument No
Latex command \phi
Example \phi β†’Β πœ™
\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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