Let F,N,A and N2 denote the properties of being finite,nilpotent,abelian and nilpotent of classes at most 2,respectively......

对任意群G,它的fFrattini子群fFrat（G）是指其所有具有有限指数的极大子群的交所构成的子群.设￡是一个群族,群论性质￡被称为￡群的fFratti......

设G是群,如果它的所有真子群都是FCmax-群（满足极大条件的FC-群）,但群本身并不具有这种性质,那么就称G为内FCmax-群.研究内FCmax-群,......