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Locally e-Fine Measurable Spaces

Zdenek Frolik
Transactions of the American Mathematical Society
Vol. 196 (Sep., 1974), pp. 237-247
DOI: 10.2307/1997026
Stable URL: http://www.jstor.org/stable/1997026
Page Count: 11
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Locally e-Fine Measurable Spaces
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Abstract

Hyper-Baire sets and hyper-cozero sets in a uniform space are introduced, and it is shown that for metric-fine spaces the property "every hyper-cozero set is a cozero set" is equivalent to several much stronger properties like being locally e-fine (defined in $\S1$), or having locally determined precompact part (introduced in $\S2$). The metric-fine spaces with these additional properties form a coreflective subcategory of uniform spaces; the coreflection is explicitly described. The theory is applied to measurable uniform spaces. It is shown that measurable spaces with the additional properties mentioned above are coreflective and the coreflection is explicitly described. The two coreflections are not metrically determined.

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