#### Document Type

Topology + Foundations

#### Publication Date

6-2017

#### Publication Source

32nd Summer Conference on Topology and Its Applications

#### Abstract

In this paper an exact homology functor from the category **Mor**_{C} of continuous maps of compact Hausdorff spaces to the category **LES** of long exact sequences of abelian groups is defined (cf. [2], [3], [5]). This functor is an extension of the Hu homology theory, which is uniquely defined on the category of continuous maps of finite CW complexes and is constructed without the relative homology groups [9]. To define the given homology functor we use the Chogoshvili construction of projective homology theory [7], [8]. For each continuous map f:X → Y of compact spaces, using the notion of the partition of spaces [7], [8] and approximations of continuous maps [1], [2], [3], V. Baladze defined the inverse system **f** = { f_{λ}, p_{λλ'}, Λ }, where Λ is the directed system of pairs λ = (α, β) of partitions, where α is refined in f^{-1}(β) and f_{λ}: X_{α} → Y_{β} is the simplicial map of nerves X_{α} and Y_{β} of closed coverings defined by partitions α and β. Using this system he has defined and studied the inverse system of chain complexes **C**_{*} **(****f****)** = { C_{*}(f_{λ}), p_{λλ'}^{#}, Λ } and the projective and spectral homology groups:

- H * (f) ≡ H_{*}(\varprojlim { C_{*}(f_{λ}), p_{λλ'}^{#}, Λ }) ^ H * (f) ≡ \varprojlim ({ H_{*}(f_{λ}), p_{λλ'}^{#}, Λ }).

A. Beridze has shown that there exists a Milnor short exact sequence (cf. [10], [11], [12]), which connects the defined homology groups:

0 → \varprojlim^{1} H_{n+1}(f_{λ}) → - H * (f) → ^ H * (f) → 0.

Using this property, he has shown that the homology groups H̅_{*}(f) satisfy the universal coefficient formula:

0 → Ext ( ^ H n+1 (f);G) → - H * (f) → Hom( ^ H n (f);G) → 0.

Consequently, using the methods developed in [4], [6] and [11], we have shown that the constructed functor is unique on the category Mor_{C}.

#### Copyright

Copyright © 2017, the Authors

#### eCommons Citation

Beridze, Anzor and Baladze, Vladimer, "On the Chogoshvili Homology Theory of Continuous Maps of Compact Spaces" (2017). *Summer Conference on Topology and Its Applications*. 15.

https://ecommons.udayton.edu/topology_conf/15

## Comments

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