Example image of eyePlorer eyePlorer map for 'Euler–Lagrange equation': Calculus of variations Differential equation Function (mathematics) Functional (mathematics) Stationary point Joseph Louis Lagrange Leonhard Euler Maxima and minima Optimization (mathematics) Calculus Derivative Fermat's theorem (stationary points) Hamilton's principle Lagrangian mechanics Classical mechanics Generalized coordinates Newton's laws of motion Continuous function Partial derivative Real number Tangent bundle Ordinary differential equation Arc length Graph of a function Line (geometry) Conservative force Newton's notation Conservation of mass Kinetic energy Lagrangian Mass Potential energy Conservation law Noether's theorem Conservation of energy Gradient Momentum Classical field theory Quantum field theory Partial differential equation Energy functional Minimal surface Tautochrone curve Mechanics Mathematics Fundamental lemma of calculus of variations First variation Total derivative Integration by parts Functional derivative