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Mathematical Sciences Classification System

55Sxx - Operations and obstructions

• 1
  55S05
  Primary cohomology operations
• 9
  55S10
  Steenrod algebra
• 55S12
  Dyer-Lashof operations
• 55S15
  Symmetric products, cyclic products
• 1
  55S20
  Secondary and higher cohomology operations
• 1
  55S25
  K-theory operations and generalized cohomology operations [See also 19D55, 19Lxx]
• 55S30
  Massey products
• 1
  55S35
  Obstruction theory
• 55S36
  Extension and compression of mappings
• 55S37
  Classification of mappings
• 55S40
  Sectioning fiber spaces and bundles
• 1
  55S45
  Postnikov systems, k-invariants
• 55S91
  Equivariant operations and obstructions [See also 19L47]
• 1
  55S99
  None of the above, but in this section