How to use less-than or equivalent to symbol in LaTeX?

There is no default command to print the less-than or equivalent to symbol to a LaTeX document.

For this you need the amssymb package, this package provides a command called \lesssim which allows you to print this symbol in the document.

Symbol/UnicodeLess-Than or Equivalent To/U+2272
Type of symbolMathematics
Package (requirement)amssymb
ArgumentNo
Latex command\lesssim
Example\lesssim → ≲
\documentclass{article}
\usepackage{amssymb}
\begin{document}
   \[ a \lesssim b \]
   \[ x_1 \lesssim x_2 \]
   \[ \frac{1}{a_1} \lesssim \frac{1}{a_2} \]
\end{document}

Output :

Useing Less-Than or Equivalent To symbol in latex.

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