Mathematical Sciences Classification System
55Qxx - Homotopy groups
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55Q05Homotopy groups, general; sets of homotopy classes
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55Q07Shape groups
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55Q10Stable homotopy groups
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55Q15Whitehead products and generalizations
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55Q20Homotopy groups of wedges, joins, and simple spaces
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55Q25Hopf invariants
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55Q35Operations in homotopy groups
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55Q40Homotopy groups of spheres
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55Q45Stable homotopy of spheres
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55Q50$J$-morphism [See also 19L20]
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55Q51$v_n$-periodicity
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55Q52Homotopy groups of special spaces
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55Q55Cohomotopy groups
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55Q70
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55Q91Equivariant homotopy groups [See also 19L47]
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55Q99None of the above, but in this section