  In a time-reversal non-invariant system the entropy production, dS/dt, may be
negative. Close to the critical point of medium it is positive: larger or
smaller as compared with one above critical point depending on whether the
transitions from lower states to higher states of the system are more (less)
probable than the reverse transitions.
  PACS numbers: 05.60.+w, 05.70.Fh, 05.70.Ln
