We may now separately consider several cases corresponding
to different subgroups of conserved D
operators, Table 1, and to the four different
categories of operators (linear or antilinear, and hermitian or antihermitian).
In subsections 3.1.1-3.1.4, we consider cases of various
D
generators being separately conserved, and in subsections
3.1.5-3.1.8, cases of pairs of generators being simultaneously
conserved. Three-generator subgroups are briefly discussed
in Sec. 3.1.9.