  Let T be a positive closed (p,p)-current of mass 1 on a compact Kahler
manifold X. Then, there exist a constant c, independent of T, and smooth
positive closed (p,p)-currents Tn and Sn of mass c such that Tn-Sn converge
weakly to T. We also extend this result to positive pluriharmonic currents.
Then we study the wedge product of positive closed (1,1)-currents having
continuous potential with positive pluriharmonic currents. As an application,
we give an estimate of the topological entropy of meromorphic maps on compact
Kahler manifolds.
