Embedding Finite Lattices into the Σ02Enumeration Degrees
✍ Scribed by Steffen Lempp and Andrea Sorbi
- Book ID
- 124978658
- Publisher
- Association for Symbolic Logic
- Year
- 2002
- Tongue
- English
- Weight
- 489 KB
- Volume
- 67
- Category
- Article
- ISSN
- 0022-4812
- DOI
- 10.2307/2694996
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📜 SIMILAR VOLUMES
We present a necessary and su cient condition for the embeddability of a principally decomposable ÿnite lattice into the computably enumerable degrees. This improves a previous result which required that, in addition, the lattice be ranked. The same condition is also necessary and su cient for a ÿni
We present a necessary and su cient condition for the embeddability of a ÿnite principally decomposable lattice into the computably enumerable degrees preserving greatest element.
## A certain lattice with eight elements is shown to be not embeddable as a lattice in the recursively enumerable degrees. This refutes the well-known Embedding Conjecture which asserted that every finite lattice could be so embedded.