20Hxx Other groups of matrices

• 20H05 Unimodular groups, congruence subgroups, See also {11F06, 19B37, 22E40, 51F20}
• 20H10 Fuchsian groups and their generalizations, See also {11F06, 22E40, 30F35, 32Nxx}
• 20H15 Other geometric groups, including crystallographic groups, See also {51-XX, especially 51F15, and 82D25}
• 20H20 Other matrix groups over fields
• 20H25 Other matrix groups over rings
• 20H30 Other matrix groups over finite fields
• 20H99 None of the above but in this section