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