In algebraic topology, a sequence of spaces Xᵢ with structure maps ΣXᵢ → Xᵢ₊₁ from (reduced) suspensions, such that its stable homotopy groups can be defined
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concepte topològic (ca)
théorie de l'homotopie (fr)
vico da spacoj (eo)
in algebraic topology, a sequence of spaces Xᵢ with structure maps ΣXᵢ → Xᵢ₊₁ from (reduced) suspensions, such that its stable homotopy groups can be defined (en)