55XX 


Algebraic topology 

55Qxx 

Homotopy groups 


55Q05 
Homotopy groups, general; sets of homotopy classes 


55Q07 
Shape groups 


55Q10 
Stable homotopy groups 


55Q15 
Whitehead products and generalizations 


55Q20 
Homotopy groups of wedges, joins, and simple spaces 


55Q25 
Hopf invariants 


55Q35 
Operations in homotopy groups 


55Q40 
Homotopy groups of spheres 


55Q45 
Stable homotopy of spheres 


55Q50 
$J$morphism [See also 19L20] 


55Q51 
$v_n$periodicity 


55Q52 
Homotopy groups of special spaces 


55Q55 
Cohomotopy groups 


55Q70 
Homotopy groups of special types [See also 55N05, 55N07] 


55Q91 
Equivariant homotopy groups [See also 19L47] 


55Q99 
None of the above, but in this section 