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Giovanni Frattini (January 8, 1852 Rome, Italy – July 21, 1925) was an Italian mathematician, noted for his contributions to group theory. He entered the University of Rome in 1869, where he studied mathematics with Giuseppe Battaglini, Eugenio Beltrami, and Luigi Cremona, obtaining his PhD. in 1875. In 1885 he published a paper where he defined a certain subgroup of a finite group. This subgroup, now known as the Frattini subgroup, is the subgroup Φ(G) generated by all the non-generators of the group G. He showed that Φ(G) is nilpotent and, in so doing, developed a method of proof known today as Frattini's argument. References Search results an = (17.0097.01) at www.emis.de Giovanni Frattini, Intorno alla generazione dei gruppi di operazioni, Rom. Acc. L. Rend. (4) I. 281–285, 455–457, 1885. External links O'Connor, John J.; Robertson, Edmund F., "Giovanni Frattini", MacTutor History of Mathematics archive, University of St Andrews, http://www-history.mcs.st-andrews.ac.uk/Biographies/Frattini.html .