On Axiomatic Characterization of Alexander-Spanier Normal Homology Theory of General Topological Spaces

Vladimer Baladze, Anzor Beridze, Leonard Mdzinarishvili

Published 2021-02-09Version 1

The Alexandroff-\v{C}ech normal cohomology theory [Mor$_1$], [Bar], [Ba$_1$],[Ba$_2$] is the unique continuous extension \cite{Wat} of the additive cohomology theory [Mil], [Ber-Mdz$_1$] from the category of polyhedral pairs $\mathcal{K}^2_{Pol}$ to the category of closed normally embedded, the so called, $P$-pairs of general topological spaces $\mathcal{K}^2_{Top}$. In this paper we define the Alexander-Spanier normal cohomology theory based on all normal coverings and show that it is isomorphic to the Alexandroff-\v{C}ech normal cohomology. Using this fact and methods developed in [Ber-Mdz$_3$] we construct an exact, the so called, Alexander-Spanier normal homology theory on the category $\mathcal{K}^2_{Top},$ which is isomorphic to the Steenrod homology theory on the subcategory of compact pairs $\mathcal{K}^2_{C}.$ Moreover, we give an axiomatic characterization of the constructed homology theory.