The higher-limit map for abelian-group presentations

Let AA be an abelian group, and let PresAb(A){\sf Pres}_{\sf Ab}(A) be the category of presentations HFAH\rightarrowtail F\twoheadrightarrow A. Define the functor

F:PresAb(A)Ab\mathfrak F:{\sf Pres}_{\sf Ab}(A)\to \sf Ab

by

F({HFA})=H.\mathfrak F(\{H\rightarrowtail F\twoheadrightarrow A\})=H.

The preceding natural monomorphism

Alim1FA\hookrightarrow\,\varprojlim{}^1 \mathfrak F

Higher-limit conjecture. The above map is a natural isomorphism.

This asserts that the first higher inverse limit of the kernel functor on abelian-group presentations recovers the presented abelian group itself. The supplied text gives the natural monomorphism but does not provide evidence that the asserted isomorphism is known or resolved.

Sources & referencesView supporting material

Primary source

Sergei O. Ivanov and Roman Mikhailov, “A higher limit approach to homology theories”, arXiv:1309.4920 (2013).

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