This man's "resolvent" is used to solve cubic equations, and his "spectrum," which ends at Freiman's constant, consists of his "numbers." One theory named for him states that if p is a prime number and f a polynomial of degree n, then the equation f 
This man's "resolvent" is used to solve cubic equations, and his "spectrum," which ends at Freiman's constant, consists of his "numbers." One theory named for him states that if p is a prime number and f a polynomial of degree n, then the equation f of x = 0 mod p has at most n solutions between 0 and p. Another namesake theorem states that the size of a subgroup must divide that of any group containing it. The maximum and minimum values of a function subject to a geometric constraint can be found with his multipliers. For 10 points, identify this man who found the five spots in a two body system where a third body of negligible mass will be stationary, known as his "points."
This man's "resolvent" is used to solve cubic equations, and his "spectrum," which ends at Freiman's constant, consists of his "numbers.
Joseph-Louis Lagrange