Articles by others on the same topic
Joseph-Louis Lagrange (1736–1813) was an influential mathematician and astronomer of Italian origin who later became a naturalized French citizen. He made significant contributions to many areas of mathematics, including calculus, number theory, and mechanics. Lagrange is known for several key achievements: 1. **Lagrange's Theorem**: In group theory, he established that the order of a subgroup divides the order of the group.