Cofibre-colimit model for coarse homology at infinity

Let E:BornCoarseCE:\mathbf{BornCoarse}\to\mathbf{C} be a coarse homology theory, let XX be a uniform bornological coarse space, and let iα:MαMi_\alpha:M_\alpha\to M be the canonical inclusions associated to a uniform shape expansion, with cofibre C(iα)C(i_\alpha). Assume that C\mathbf{C} is complete and that EE is additive. Cofibre-colimit conjecture. There is an equivalence

colimα(E()Σ+)lf(C(iα))EO(X).\operatorname{colim}_{\alpha}\left(E(\ast)\wedge\Sigma_{+}^{\infty}\right)^{lf}(C(i_\alpha))\simeq E\mathcal{O}^{\infty}(X).

This would identify the coarse homology at infinity of XX with a colimit of locally finite cofibres arising from its uniform shape model.

Sources & referencesView supporting material

Primary source

Felix Lange, “Coarse Homotopy Theory and Shape Theory”, arXiv:2606.14212 (2026).

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