Milnor exact sequence for coarse homology of nested compacta

Let YY be a compact Hausdorff space and let (Yi)iN(Y_i)_{i\in\mathbb{N}} be a decreasing family of closed subspaces, with intersection given the subspace topology. Let HXOH\mathcal{X}\mathcal{O} denote the coarse homology theory used in the source. Coarse-homology Milnor-sequence conjecture. For every nN0n\in\mathbb{N}_0, there is an exact sequence

0limiN1HXn+1O(Yi)HXnO(iNYi)limiNHXnO(Yi)0.0\to{\lim}^{1}_{i\in\mathbb{N}}H\mathcal{X}_{n+1}\mathcal{O}(Y_i)\to H\mathcal{X}_{n}\mathcal{O}\left(\bigcap_{i\in\mathbb{N}}Y_i\right)\to\lim_{i\in\mathbb{N}}H\mathcal{X}_{n}\mathcal{O}(Y_i)\to0.

This is the proposed inverse-limit exact sequence for coarse homology under decreasing intersections of compact spaces.

Sources & referencesView supporting material

Primary source

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

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