The convergence of these various sources into a uniform theory of groups started with Camille Jordan's Traité des substitutions et des équations algébriques (1870). Walther von Dyck (1882) introduced the idea of specifying a group by means of generators and relations, and was also the first to give an axiomatic definition of an "abstract group", in the terminology of the time. As of the 20th century, groups gained wide recognition by the pioneering work of Ferdinand Georg Frobenius and William Burnside, who worked on representation theory of finite groups, Richard Brauer's modular representation theory and Issai Schur's papers. The theory of Lie groups, and more generally locally compact groups was studied by Hermann Weyl, Élie Cartan and many others. Its algebraic counterpart, the theory of algebraic groups, was first shaped by Claude Chevalley (from the late 1930s) and later by the work of Armand Borel and Jacques Tits. COUNT 4
QSN1 When did the uniform theory of groups develop from different sources?  ANS1 1870 QSN2 Who presented a method for specifying a group by means of generators and relations? ANS2 Walther von Dyck QSN3 What theory did Hermann Weyl study in addition to locally compact groups? ANS3 The theory of Lie groups QSN4 Who initially molded the theory of algebraic groups? ANS4 Claude Chevalley