Lattice nonembeddings and initial segments of the recursively enumerable degrees (Q757358)
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scientific article; zbMATH DE number 4191613
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Lattice nonembeddings and initial segments of the recursively enumerable degrees |
scientific article; zbMATH DE number 4191613 |
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Lattice nonembeddings and initial segments of the recursively enumerable degrees (English)
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1990
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The structure of an arbitrary initial segment of the upper semilattice of r.e. degrees is investigated. Main result: There exists a nonzero r.e. degree that bounds no critical triple. Conjecture: Every lattice that contains no critical triple is embeddable below every nonzero r.e. degree.
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embedding
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initial segment of the upper semilattice of r.e. degrees
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critical triple
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