The higher-limit map for abelian-group presentations

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

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

by

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

The preceding natural monomorphism

A↪ lim←⁡1FA\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.

References

Primary source

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

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