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
- 55Q30 Homotopy groups of triads, $n$-ads
- 55Q35 Operations in homotopy groups
- 55Q40 Homotopy groups of spheres
- 55Q45 Stable homotopy of spheres
- 55Q50 $J$-morphism, See also {19L20}
- 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
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