| 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 |
