55Sxx

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55Sxx Operations and obstructions {Info & Stats}

• 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