70H45 Constrained dynamics, Dirac's theory of constraints [See also <a href="#code:70F20">70F20</a>, <a href="#code:70F25">70F25</a>, <a href="#code:70Gxx">70Gxx</a>]

70H99 None of the above, but in this section

70J50 Systems arising from the discretization of structural vibration problems

70J99 None of the above, but in this section

70Kxx Nonlinear dynamics [See also <a href="#code:34Cxx">34Cxx</a>, <a href="#code:37-XX">37-XX</a>]

70K05 Phase plane analysis, limit cycles

70K42 Equilibria and periodic trajectories

70K43 Quasi-periodic motions and invariant tori

70K44 Homoclinic and heteroclinic trajectories

70K55 Transition to stochasticity (chaotic behavior) [See also <a href="#code:37D45">37D45</a>]

70K70 Systems with slow and fast motions

70K99 None of the above, but in this section

70Lxx Random vibrations [See also <a href="#code:74H50">74H50</a>]

70L05 Random vibrations [See also <a href="#code:74H50">74H50</a>]

70L99 None of the above, but in this section

70M99 None of the above, but in this section

70P99 None of the above, but in this section

70Qxx Control of mechanical systems [See also <a href="#code:60Gxx">60Gxx</a>, <a href="#code:60Jxx">60Jxx</a>]

70Q99 None of the above, but in this section

70Sxx Classical field theories [See also <a href="#code:37Kxx">37Kxx</a>, <a href="#code:37Lxx">37Lxx</a>, <a href="#code:78-XX">78-XX</a>, <a href="#code:81Txx">81Txx</a>, <a href="#code:83-XX">83-XX</a>]

70S05 Lagrangian formalism and Hamiltonian formalism

70S15 Yang-Mills and other gauge theories

70S20 More general nonquantum field theories

70S99 None of the above, but in this section

74-00 General reference works (handbooks, dictionaries, bibliographies, etc.)

74-01 Instructional exposition (textbooks, tutorial papers, etc.)

74-02 Research exposition (monographs, survey articles)

74-03 Historical (must also be assigned at least one classification number from Section 01)

74-04 Explicit machine computation and programs (not the theory of computation or programming)

74-06 Proceedings, conferences, collections, etc.