83C05  Einstein's equations (general structure, canonical formalism, Cauchy problems)


83C10  Equations of motion


83C15  Exact solutions


83C20  Classes of solutions; algebraically special solutions, metrics with symmetries


83C22  EinsteinMaxwell equations


83C25  Approximation procedures, weak fields


83C27  Lattice gravity, Regge calculus and other discrete methods


83C30  Asymptotic procedures (radiation, news functions, {\scr H}spaces, etc.)


83C35  Gravitational waves


83C40  Gravitational energy and conservation laws; groups of motions


83C45  Quantization of the gravitational field


83C47  Methods of quantum field theory [See also 81T20]


83C50  Electromagnetic fields


83C55  Macroscopic interaction of the gravitational field with matter (hydrodynamics, etc.)


83C57  Black holes


83C60  Spinor and twistor methods; NewmanPenrose formalism


83C65  Methods of noncommutative geometry [See also 58B34]


83C75  Spacetime singularities, cosmic censorship, etc.


83C80  Analogues in lower dimensions


83C99  None of the above, but in this section

