Systems theory to social sciences (see David Easton's seminal development of the "political system" as an analytical construct), the original theorists explored the implications of twentieth century advances in terms of systems. People have studied subjects like complexity, self-organization, connectionism and adaptive systems in the 1940s and 1950s. In fields like cybernetics, researchers such as Norbert Wiener, William Ross Ashby, John von Neumann and Heinz von Foerster, examined complex systems mathematically. John von Neumann discovered cellular automata and self-reproducing systems, again with only pencil and paper. Aleksandr Lyapunov and Jules Henri Poincaré worked on the foundations of chaos theory without any computer
Stephen L. Adler to Hamiltonian equations of motion. The construction of a statistical mechanics of these matrix models leads, so Adler says, to an "emergent effective complex quantum field theory". Adler's Trace Dynamics has been discussed in relation to the differential space theory of quantum systems by Norbert Wiener and Amand Siegel, to its variant by David Bohm and Jeffrey Bub, and to modifications of the Schrödinger equation by additional terms such as the quantum potential term or stochastic terms, and to hidden variable theories. Stephen L. Adler Stephen Louis Adler (born November 30, 1939) is an American physicist specializing in elementary particles