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On Cauchy Homomorphisms of Nearness Frames
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AbstractTo include the pointfree case, the notion of a Cauchy map easily extends as the condition that the preimage of any regular Cauchy filter contains a regular Cauchy filter. This extension, however, can be unsatisfactory if the regular Cauchy filters are scarce or non‐existent, making the condition too weak, indeed sometimes even void. In this paper a variant of the notion, independent on the existence of any kind of filters, is studied: a homomorphism is called fully Cauchy if it lifts to the completions. This is generally stronger than, and in the spatial and metric cases it coincides with the previously mentioned property. Moreover, it is stable under localization.
Title: On Cauchy Homomorphisms of Nearness Frames
Description:
AbstractTo include the pointfree case, the notion of a Cauchy map easily extends as the condition that the preimage of any regular Cauchy filter contains a regular Cauchy filter.
This extension, however, can be unsatisfactory if the regular Cauchy filters are scarce or non‐existent, making the condition too weak, indeed sometimes even void.
In this paper a variant of the notion, independent on the existence of any kind of filters, is studied: a homomorphism is called fully Cauchy if it lifts to the completions.
This is generally stronger than, and in the spatial and metric cases it coincides with the previously mentioned property.
Moreover, it is stable under localization.
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