spectrum
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-US/ˈspɛktɹəm/
en-GB/ˈspɛktɹəm/
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