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MATHEMATICS
Linear homeomorphisms of topological almost modules of continuous functions and coincidence of dimension
A. V. Titova Tomsk State University, Tomsk, Russian Federation
Abstract:
In this paper, the space of continuous functions
$C_p(X,G)$, where
$G$ is a topological space, is considered. If the set
$G$ is endowed with an almost ring structure, the set
$C_p(X,G)$ is a topological almost module. It is proved that the dimension
$dim$ of the topological space
$X$ is an isomorphic invariant of its topological almost module
$C_p(X,I)$, where
$I=[0,1)$ is a naturally defined almost ring.
This statement is based on ideas of G. G. Pestov’s work «The coincidence of dimension
$dim$ of
$l$-equivalent topological spaces», where the following theorem was formulated: if
$C_p(X,\mathbf{R})$ and
$C_p(Y,\mathbf{R})$ are linearly homeomorphic spaces, then
$dim\, X = dim\, Y$. Here,
$X$ and
$Y$ are arbitrary totally regular spaces, and
$C_p(X,\mathbf{R})$ is the space of all continuous real functions on
$X$ with the pointwise convergence topology. Note that Pestov’s theorem was generalized to the case of uniform homeomorphisms by S. P. Gul'ko.
Keywords:
almost ring, topological almost module, continuous homomorphism, space of continuous functions, pointwise convergence topology.
UDC:
515.127 Received: 15.05.2014