| 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 |
| 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 |
| 55S99 |
- |
Miscellaneous |
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