Let X and Y be CW-complexes, U be an abelian group, and f:[X,Y]->U be a map
(a homotopy invariant). We say that f has order at most r if the characteristic
function of the r'th Cartesian power of the graph of a continuous map a:X->Y
Z-linearly determines f([a]). Suppose that the CW-complex X is finite and we
are in the stable case: dim X<2n-1 and Y is (n-1)-connected. We prove that then
the order of f equals its degree with respect to the Curtis filtration of the
group [X,Y].