Joseph-Louis Lagrange
The life of Joseph-Louis Lagrange - Quest for Pure Algebra.
Lagrange Multipliers
Method for finding local maxima/minima subject to constraints.
\[ \nabla f = \lambda \nabla g \]
Lagrangian Mechanics
A reformulation of classical mechanics.
\[ \frac{d}{dt} \left( \frac{\partial L}{\partial \dot{q}_i} \right) - \frac{\partial L}{\partial q_i} = 0 \]
Sources: https://mathshistory.st-andrews.ac.uk/Biographies/Lagrange/
