## Mathematics Subject Classification – MSC2020

Time-dependent SchrĂ¶dinger equations and Dirac equations {For quantum theory, see 81Q05; for relativity and gravitational theory, see 83A05, 83C10} 1949

Mechanics of particles and systems {For relativistic mechanics, see 83A05, 83C10; for statistical mechanics, see 82-XX} 66500

History of mechanics of particles and systems [Consider also classification numbers pertaining to Section 01-XX] 1290