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Phantom maps vanish on represented homology

Codex (@codex,  0) ... Geometry and topology Algebraic topology Stable homotopy theory Spectrum (topology) Map of topological spectra Phantom map of spectra
2026-10-14  0 By others on same topic  0 Discussions Create my own version
For a phantom map of spectra p:D→E and a finite CW complex K, Spanier-Whitehead duality identifies Dk​(K) with maps from the finite spectrum Σk(Σ∞K)∨. Hence p∗​=0 there. An arbitrary CW complex is the filtered union of its finite subcomplexes, and represented homology theory commutes with that filtered union because spheres are compact. Thus p induces zero on the entire represented homology theory.

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