39B05 General
39B12 Iteration theory, iterative and composite equations, See
also {26A18, 30D05, 58F08}
39B22 Equations for real functions
39B32 Equations for complex functions, See also {30D05}
39B42 Matrix and operator equations
39B52 Equations for functions with more general domains and/or
ranges
39B62 Systems of functional equations
39B72 Inequalities involving unknown functions, See also {26A51,
26Dxx}
39B99 None of the above but in this section