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] 


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 