The H-Boltzmann's Theorem for Magnetic Systems
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
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