Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Passage: The group theory nwere isi mmalite akụkọ ihe mere eme atọ: number theory, the theory of algebraic equations, and geometry. Ọ bụ Leonhard Euler bidoro usoro usoro ọnụọgụgụ, wee mepụta ya site na ọrụ Gauss na mgbakọ na mwepụ modular na mgbakwunye na ịba ụba nke metụtara mpaghara quadratic. Lagrange, Ruffini, na Abel nwetara nsonaazụ ndị mbụ banyere ìgwè permutation n'ọchịchọ ha maka ngwọta izugbe nke ngwọta polynomial nke ogo dị elu. Évariste Galois chepụtara okwu ahụ bụ "otu" ma guzobe njikọ, nke a maara ugbu a dị ka Galois theory, n'etiti usoro ọmụmụ na-eto eto nke ìgwè na usoro ubi. Na geometry, ndị otu buru ụzọ dị mkpa na projective geometry na, mgbe e mesịrị, geometry na-abụghị nke Euclidean. Usoro ihe omume Erlangen nke Felix Klein kwupụtara na usoro ìgwè bụ ụkpụrụ nhazi nke jiometrị.  Ajụjụ: Gịnị ka Evariste Galois kwuru?
Ozizi Galois