# Carathéodory–Jacobi–Lie theorem

Carathéodory–Jacobi–Lie theorem The Carathéodory–Jacobi–Lie theorem is a theorem in symplectic geometry which generalizes Darboux's theorem.

Statement Let M be a 2n-dimensional symplectic manifold with symplectic form ω. For p ∈ M and r ≤ n, let f1, f2, ..., fr be smooth functions defined on an open neighborhood V of p whose differentials are linearly independent at each point, or equivalently {displaystyle df_{1}(p)wedge ldots wedge df_{r}(p)neq 0,} where {fi, fj} = 0. (In other words, they are pairwise in involution.) Here {–,–} is the Poisson bracket. Then there are functions fr+1, ..., fn, g1, g2, ..., gn defined on an open neighborhood U ⊂ V of p such that (fi, gi) is a symplectic chart of M, i.e., ω is expressed on U as {displaystyle omega =sum _{i=1}^{n}df_{i}wedge dg_{i}.} Applications As a direct application we have the following. Given a Hamiltonian system as {displaystyle (M,omega ,H)} where M is a symplectic manifold with symplectic form {displaystyle omega } and H is the Hamiltonian function, around every point where {displaystyle dHneq 0} there is a symplectic chart such that one of its coordinates is H.

References Lee, John M., Introduction to Smooth Manifolds, Springer-Verlag, New York (2003) ISBN 0-387-95495-3. Graduate-level textbook on smooth manifolds.

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