Homological algebra of multivalued action functionals
arXiv:math-ph/0112031
Abstract
We outline a cohomological treatment for multivalued (classical) action functionals. We point out that an application of Takens' theorem, after Zuckerman, Deligne and Freed, allows to conclude that multivalued functionals yield globally defined variational equations.
9 pages, AMSLaTeX (amsart class). Version to appear in Letters in Mathematical Physics