In 1921 he was able to give a very precise definition of the quantity of heat and the most satisfactory mathematical statement of the law of [[thermodynamics]]. His most famous achievement came in 1926 when he collaborated with one of his students, [[Werner Heisenberg]], to develop a mathematical formulation that would describe Heisenberg's first laws of the new quantum theory (matrix mechanics). | In 1921 he was able to give a very precise definition of the quantity of heat and the most satisfactory mathematical statement of the law of [[thermodynamics]]. His most famous achievement came in 1926 when he collaborated with one of his students, [[Werner Heisenberg]], to develop a mathematical formulation that would describe Heisenberg's first laws of the new quantum theory (matrix mechanics). |