In the "Big Bang statistics" section, after defining entropy it is said that the entropy of a system never decreases, but the second law of thermodynamics states that the entropy of the UNIVERSE never decreases, not the system. The entropy of a system can decrease.
In the "Big Bang statistics" section, after defining entropy it is said that the entropy of a system never decreases, but the second law of thermodynamics states that the entropy of the UNIVERSE never decreases, not the system. The entropy of a system can decrease.