On compactification of metric spaces |
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Authors: | M Reichaw-Reichbach |
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Institution: | (1) Technion-Israel Institute of Technology, Haifa |
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Abstract: | Iff:X →X* is a homeomorphism of a metric separable spaceX into a compact metric spaceX* such thatf(X)=X*, then the pair (f,X*) is called a metric compactification ofX. An absoluteG
δ-space (F
σ-space)X is said to be of the first kind, if there exists a metric compactification (f,X*) ofX such that
, whereG
i are sets open inX* and dimFr(G
i)]<dimX. (Fr(G
i) being the boundary ofG
i and dimX — the dimension ofX). An absoluteG
δ-space (F
σ-space), which is not of the first kind, is said to be of the second kind. In the present paper spaces which are both absoluteG
δ andF
σ-spaces of the second kind are constructed for any positive finite dimension, a problem related to one of A. Lelek in 11]
is solved, and a sufficient condition onX is given under which dim X* −f(X)]≧k, for any metric compactification (f,X*) ofX, wherek≦dimX is a given number.
This research has been sponsored by the U.S. Navy through the Office of Naval Research under contract No. 62558-3315. |
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Keywords: | |
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