He names factors termed lambda and mu which can be used to find the extrema of a function and are called his namesake multipliers.
This man names a result stating that the order of every subgroup of a group must divide the order of that group, and he lends his name to the remainder of the Taylor series. This man also proved that every positive integer is the sum of four squares, and the difference between kinetic and potential energy serves as an alternative to the Hamiltonian in defining his namesake mechanics. He names factors termed lambda and mu which can be used to find the extrema of a function and are called his namesake multipliers. For 10 points, name this French mathematician who names a set of five points in space that are a solution to the three-body problem.
This man names a result stating that the order of every subgroup of a group must divide the order of that group, and he lends his name to the remainder of the Taylor series.
Joseph Louis {Lagrange} [accept {Giuseppe Lodovico Lagrangia}]