Dynamical properties of reaction networks were studied in chemistry and physics after the invention of the law of mass action. The essential steps in this study were introduction of detailed balance for the complex chemical reactions by Rudolf Wegscheider (1901),[1] development of the quantitative theory of chemical chain reactions by Nikolay Semyonov (1934),[2] development of kinetics of catalytic reactions by Cyril Norman Hinshelwood,[3] and many other results.