  We construct a functor which maps conjugate pseudo-Anosov automorphisms of a
surface to the so-called stably isomorphic stationary AF-algebras; the functor
gives new topological invariants of three dimensional manifolds coming from the
known invariants of the AF-algebras. The main invariant is a triple (L, [I],
K), where L is an integral order in the real number field K and [I] the
equivalence class of ideals in L.
