Geodesic
A characterization of $C_2(q)$ where $q>5$
Commentationes Mathematicae Universitatis Carolinae, Tome 43 (2002) no. 1, pp. 9-21.

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The order of every finite group $G$ can be expressed as a product of coprime positive integers $m_1,\dots, m_t$ such that $\pi (m_i)$ is a connected component of the prime graph of $G$. The integers $m_1,\dots, m_t$ are called the order components of $G$. Some non-abelian simple groups are known to be uniquely determined by their order components. As the main result of this paper, we show that the projective symplectic groups $C_2(q)$ where $q>5$ are also uniquely determined by their order components. As corollaries of this result, the validities of a conjecture by J.G. Thompson and a conjecture by W. Shi and J. Be for $C_2(q)$ with $q>5$ are obtained.
Classification : 05C25, 20D05, 20D60, 20G40
Keywords: prime graph; order component; finite group; simple group 
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Iranmanesh, A.; Khosravi, B. A characterization of $C_2(q)$ where $q>5$. Commentationes Mathematicae Universitatis Carolinae, Tome 43 (2002) no. 1, pp. 9-21. http://geodesic.mathdoc.fr/item/CMUC_2002__43_1_a1/