\documentclass[12pt]{article}
\usepackage{amsmath,amssymb,amsfonts}
\begin{document}
Let $G$ be a finite group. Based on the prime graph of
$G$, the order of $G$ can be divided into a product of coprime
positive integers. These integers are called order components of
$G$ and the set of order components is denoted by $OC(G)$. Some
non-abelian simple groups are known to be uniquely determined by
their order components.
In this paper, we prove that if $q=2^n$,
then the simple group $C_4(q)$ can be uniquely determined by its
order components. Also if $q$ is an odd prime power and
$OC(G)=OC(C_4(q))$, then $G\cong{C_4(q)}$ or $G\cong{B_4(q)}$.
\end{document}