MF-traces and a Lower Bound for the Topological Free Entropy Dimension   in Unital C*-algebras
  We continue previous work on Voiculescu's topological free entropy dimension {\delta}_{top}. We introduce the notions of MF-trace, MF-ideal, and MF-nuclearity and use these concepts to obtain upper and lower bounds for {\delta}_{top}, and in many cases we obtain an exact formula for {\delta}_{top}. We also discuss semicontinuity properties of {\delta}_{top}. 
Don Hadwin, Qihui Li, Weihua Li, Junhao Shen
math.OA