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Paper IPM / M / 9455  


Abstract:  
Let G be a finite group. Based on the GruenbergKegel graph GK(G), the order of G can be divided into a product of coprime positive integers. These integers are called the order components of G and the set of order components is denoted by OC(G). In this article we prove that, if S is a nonAbelian finite simple group with a disconnected graph GK(S), with an exception of U_{4}(2) and U_{5}(2), and G is a finite group with OC(G) = OC(S), then G is neither Frobenius nor 2Frobenius. For a group S isomorphic to U_{4}(2) or U_{5}(2), we construct examples of 2Frobenius groups G such that OC(S) = OC(G). In particular, the simple groups U_{4}(2) and U_{5}(2) are not recognizable by their order components.
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