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< 55Rxx | 55-XX | 55Txx >
55-XX Algebraic topology
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
< 55Rxx | 55-XX | 55Txx >
American Mathematical Society