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Open Positions
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55Sxx
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Operations and obstructions
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- 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
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