Structure of the semilattice of tt1-degrees (Q1820775)
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scientific article; zbMATH DE number 3995656
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Structure of the semilattice of tt1-degrees |
scientific article; zbMATH DE number 3995656 |
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Structure of the semilattice of tt1-degrees (English)
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1985
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A set A is tt1-reduced to a set B iff \(A\leq_ mB\oplus \bar B\). The author studies properties of tt1-reducibility. For example, the upper semilattice of all tt1-degrees is a c-universal semilattice of continuum cardinality.
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tt1-reducibility
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upper semilattice
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