摘要: The purpose of this paper is to examine in detail the questions involved Example 10 Martin’s article (also volume). It arises from following very general question. Given a manifold with flow on it and given real valued function manifold, under what circumstances can distinguish orbits different points? That is, if h ∈ C ∞(M) φ flow, then $$h(\Phi (x,t)) = h(\Phi (y,t))$$ for all t, does imply that x= y? If so, we say observesthe pair (M, φ), or triple (M,φ,h) observable.