55XX 


Algebraic topology 

55Nxx 

Homology and cohomology theories [See also 57Txx] 


55N05 
Čech types 


55N07 
SteenrodSitnikov homologies 


55N10 
Singular theory 


55N15 
$K$theory [See also 19Lxx} For algebraic $K$theory, see 18F25, 19XX] 


55N20 
Generalized (extraordinary) homology and cohomology theories 


55N22 
Bordism and cobordism theories, formal group laws [See also 14L05, 19L41, 57R75, 57R77, 57R85, 57R90] 


55N25 
Homology with local coefficients, equivariant cohomology 


55N30 
Sheaf cohomology [See also 18F20, 32C35, 32L10] 


55N32 
Orbifold cohomology 


55N33 
Intersection homology and cohomology 


55N34 
Elliptic cohomology 


55N35 
Other homology theories 


55N40 
Axioms for homology theory and uniqueness theorems 


55N45 
Products and intersections 


55N91 
Equivariant homology and cohomology [See also 19L47] 


55N99 
None of the above, but in this section 