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.

\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 :

• Less than or equal to(≤) symbol in LaTeX
• Not Less Than(≮) symbol in LaTeX
• Less than over not equal to(≨) symbol in LaTeX
• Less-Than or Slanted Equal To(⩽) symbol in LaTeX