Notices of the American Mathematical Society

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Featured Articles and Invitations from the AMS

A Guide to Entropy and the Second Law of Thermodynamics

Elliott H. Lieb and Jakob Yngvason

Entropy is a measure of the irreversibility of energy-preserving processes in classical thermodynamics, but its exact definition often founders in imprecision. The authors sketch a recent rigorous development of entropy in terms of physically reasonable axioms.