Mathematics Subject Classification 1991

55Sxx Operations and obstructions ( 0 Dok. )

• 55S05 Primary cohomology operations ( 0 Dok. )
• 55S10 Steenrod algebra ( 0 Dok. )
• 55S12 Dyer-Lashof operations ( 0 Dok. )
• 55S15 Symmetric products, cyclic products ( 0 Dok. )
• 55S20 Secondary and higher cohomology operations ( 0 Dok. )
• 55S25 $K$-theory operations and generalized cohomology operations, See also {19D55, 19Lxx} ( 0 Dok. )
• 55S30 Massey products ( 0 Dok. )
• 55S35 Obstruction theory ( 0 Dok. )
• 55S36 Extension and compression of mappings ( 0 Dok. )
• 55S37 Classification of mappings ( 0 Dok. )
• 55S40 Sectioning fiber spaces and bundles ( 0 Dok. )
• 55S45 Postnikov systems, $k$-invariants ( 0 Dok. )
• 55S91 Equivariant operations and obstructions, See also {19L47} ( 0 Dok. )
• 55S99 None of the above but in this section ( 0 Dok. )