摘要: Let us consider a Lie (super)algebra G spanned by Tα where are quantum observables in BV formalism. It is proved that for every tensor cα...α determines homology class of the algebra expression cα...αTα...Tα again observable. This theorem used to construct sigma model. We apply this construction explain Kontsevich's results about relation between Hamiltonian vector fields and topological invariants manifolds.