## Mathematics Subject Classification – MSC2020

Groups and semigroups of linear operators [See also 20M20] {For nonlinear operators, see 47H20} 4785

General theory of ordinary differential operators [Should also be assigned at least one other classification number in Section 47-XX] [See also 34Bxx, 34Lxx] 5446

General theory of partial differential operators [Should also be assigned at least one other classification number in Section 47-XX] [See also 35Pxx, 58Jxx] 5375

Nonlinear operators and their properties {For global and geometric aspects, see 49J53, 58-XX, especially 58Cxx} 35002

Equations and inequalities involving nonlinear operators [See also 46Txx] {For global and geometric aspects, see 58-XX} 22315