The pro-homology conjecture for cosheaf homology satellites

Let XX be a topological space, let OPEN(X)OPEN(X) be its standard site, and let NORM(X)NORM(X) be the site of normal open sets. Write Hn(X,A#)H_n(X,A_{\#}) for the cosheaf homology and LnH0(X,A#)L_nH_0(X,A_{\#}) for the left satellites of H0H_0.

Pro-homology conjecture. On the standard site OPEN(X)OPEN(X), if XX is Hausdorff paracompact, then

H_n\left(X,\operatorname{pro}\relax\protect\ifmmode\expandafter\text@\else\expandafter\text\fi{-}H_0(\bullet,A)\right)=H_n(X,A_{\#}):=L_nH_0(X,A_{\#})\simeq \operatorname{pro}\relax\protect\ifmmode\expandafter\text@\else\expandafter\text\fi{-}H_n(X,A).

The same isomorphisms should hold on NORM(X)NORM(X) for all topological spaces. This conjecture identifies the derived cosheaf-theoretic construction with shape pro-homology under the stated hypotheses; the paper notes that general spaces may lack suitable polyhedral expansions, so the unrestricted comparison remains unavailable.

Sources & referencesView supporting material

Primary source

Andrei V. Prasolov, “Cosheaves”, arXiv:1804.07988 (2018).

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