Mathematical Sciences Classification System

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

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