Source: wikibot/legendre-clebsch-condition
= Legendre–Clebsch condition
{wiki=Legendre–Clebsch_condition}
The Legendre–Clebsch condition is a criterion in the calculus of variations that helps determine whether a given differential equation can be derived from a variational principle, typically in the context of optimal control or mechanics. More specifically, it relates to the conditions under which a function can be considered a Hamiltonian function in a variational formulation.