Abstract
A basic tool in domain theory and point-free topology are (Scott) open filters in a partially ordered set. A systematic investigation of that concept shows that central notions and facts like Lawson’s famous self-duality of the category of continuous domains may be established without invoking any choice principles, if only continuous domains are replaced by so-called δ-domains, which coincide with the former in the presence of dependent choices. Many of the conclusions remain valid for the more flexible notion of ζ-domains, comprising important variants such as algebraic or hypercontinuous domains.
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To the memory of Horst Herrlich, who opened our eyes for miracles caused by the axiom of choice and for disasters caused by its absence
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Erné, M. Choice-Free Dualities for Domains. Appl Categor Struct 24, 471–496 (2016). https://doi.org/10.1007/s10485-016-9444-0
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DOI: https://doi.org/10.1007/s10485-016-9444-0
Keywords
- Algebraic
- (ζ-) basis
- Choice principle
- Compact
- (ζ-) continuous
- (ζ-) domain
- Duality
- Open filter
- Supercompact
- Supercontinuous