## Mathematics Subject Classification – MSC2020

Time-dependent Schrödinger equations and Dirac equations {For quantum theory, see 81Q05; for relativity and gravitational theory, see 83A05, 83C10} 1947

KdV equations (Korteweg-de Vries equations) {For dynamical systems and ergodic theory, see 37K10} 17158

NLS equations (nonlinear Schrödinger equations) {For dynamical systems and ergodic theory, see 37K10} 13465

Maxwell equations {For optics and electromagnetic theory, see 78A25; for relativity and gravitational theory, see 83C22} 1265

Fokker-Planck equations {For fluid mechanics, see 76X05, 76W05; for statistical mechanics, see 82C31} 1194

PDEs in connection with mean field game theory {For calculus of variations and optimal control, see 49N80; for game theory, see 91A16} 13