How to use less than(<) symbol in LaTeX?

Symbol/UnicodeLess than/U+003C
Type of symbolStrict inequality
Package (requirement)No
ArgumentNo
Latex command<
Example< → <

This less than symbol most of the time used in mathematics has no default command to print in a latex document. You can easily type this symbol by pressing the Shift + < key on the keyboard.

\documentclass{article}
\begin{document}
   \[ 5 < 7 \]
   \[ a_1 < a_2 \]
   \[ \frac{1}{x^2} < \frac{1}{y^2} \]
\end{document}

Output :

Use less than symbol in latex.

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