Comment on "Failure of the work-Hamiltonian connection for free-energy   calculations" by Jose M. G. Vilar and J. Miguel Rubi
  I point out that the arguments raised by Vilar and Rubi against the work-Hamiltonian connection in free-energy calculations imply, if correct, the failure of the statistical mechanical expression of the thermodynamical free-energy via the logarithm of the partition function. 
Luca Peliti