The solution to Dido's Problem involves the application of this technique, 
The solution to Dido's Problem involves the application of this technique, as does the solution of Sinclair's Soap Film Problem, to which the solution is a catenoid. Morse theory is a generalization of this technique, drawing a relationship between the stationary points of a smooth, real-valued function on a manifold and the global topology of the manifold. In solving problems with this method, one frequently encounters functional derivatives, and its most famous result, the differential equations of motion, are a result of the functional differentiation of the Hamiltonian. Applied in physics to find maxima and minima, 2  FTP, identify this mathematical technique concerned with finding the path for which a given function has a stationary value.
The solution to Dido's Problem involves the application of this technique, as does the solution of Sinclair's Soap Film Problem, to which the solution is a catenoid.
calculus of variations