A new characterization of symmetric group by NSE

چکیده مقاله

Let G be a group and ω(G) be the set of element orders of G. Let k ∈ ω(G) and m_k(G) be the number of elements of order k in G. Let nse(G) = {m_k(G): k ∈ ω(G)}. Assume r is a prime number and let G be a group such that nse(G) = nse(S_r), where S_r is the symmetric group of degree r. In this paper we prove that G ≅ S_r, if r divides the order of G and r² does not divide it. To get the conclusion we make use of some well-known results on the prime graphs of finite simple groups and their components. © 2017, Institute of Mathematics of the Academy of Sciences of the Czech Republic, Praha, Czech Republic.