Second law of thermodynamics
The second law of thermodynamics may be expressed in many specific ways, the most prominent classical statements being the statement by Rudolf Clausius (1854), the statement by Lord Kelvin (1851), and the statement in axiomatic thermodynamics by Constantin Carathéodory (1909). These statements cast the law in general physical terms citing the impossibility of certain processes. The Clausius and the Kelvin statements have been shown to be equivalent.
Nicholas Georgescu-Roegen
Georgescu-Roegen's formulation of a fourth law of thermodynamics and the concept of material entropy soon generated a prolonged controversy, involving both physicists and ecological economists; but some twelve to fifteen years after Georgescu-Roegen's death, a consensus on this subject matter finally emerged along the following lines:In the same vein as this consensus, a full chapter on the economics of Georgescu-Roegen has approvingly been included in one elementary physics textbook on the historical development of thermodynamics, and the details (Georgescu-Roegen's mistakes) about the fourth law and material entropy are omitted there.