Topological Orbit Dimension of MF $C^*$-algebras

This paper is a continuation of our work on D. Voiculescu's topological free entropy dimension in unital C*-algebras. In this paper we first prove the topological free entropy dimension of a MF-nuclear and inner QD algebra is irrelevant to its generating family. Then we give the relation between the topological orbit dimension $K_{top}^2$ and the modified free orbit dimension$K_2^2$ by using MF-traces. We also introduce a new invariant $K_{top}^3$ which is a modification of the topological orbit dimension $K_{top}^2$ when$K_{top}^2$ is defined. As the applications of $K_{top}^3$, We prove that$K_{top}^3(A)=0$ if A has property $c^*-{\Gamma}$ and has no finite-dimensional representations. We also give the definition of property MF-c^*-{\Gamma}. We then conclude that, for the unital MF $C^*$-algebra with no finite-dimensional representations, if A has property MF-c*-{\Gamma}, then $K_{top}^3(A)=0$.