Giovanni Frattini
Born	(1852-01-08)8 January 1852 Rome, Papal States
Died	21 July 1925(1925-07-21) (aged 73) Rome, Italy
Nationality	Italian
Alma mater	Sapienza University of Rome
Known for	Frattini subgroup Frattini's argument
Awards	ICM Speaker (1908)
Scientific career
Fields	Mathematics
Doctoral advisor	Giuseppe Battaglini Eugenio Beltrami

Giovanni Frattini (8 January 1852 – 21 July 1925) was an Italian mathematician, noted for his contributions to group theory.

Frattini entered the University of Rome in 1869, where he studied mathematics with Giuseppe Battaglini, Eugenio Beltrami, and Luigi Cremona, obtaining his Laurea 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 ${\displaystyle \Phi (G)}$ generated by all the non-generators of the group ${\displaystyle G}$. He showed that ${\displaystyle \Phi (G)}$ is nilpotent and, in so doing, developed a method of proof known today as Frattini's argument.^[1]

Besides group theory, he also studied differential geometry and the analysis of second degree indeterminates. ^[2]

• Hall, Marshall (1959). The theory of groups. New York, N.Y.: Macmillan.

• Emaldi, M.; Zacher, G., Giovanni Frattini (1852–1925), matematico (in italian), Advances in group theory 2002, 191–207, Aracne, Rome, 2003.

• O'Connor, John J.; Robertson, Edmund F., "Giovanni Frattini", MacTutor History of Mathematics Archive, University of St Andrews
• Giovanni Frattini at the Mathematics Genealogy Project