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The ∀∃-theory of the effectively closed Medvedev degrees is decidable

✍ Scribed by Joshua A. Cole; Takayuki Kihara


Book ID
105842362
Publisher
Springer
Year
2009
Tongue
English
Weight
224 KB
Volume
49
Category
Article
ISSN
0933-5846

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A Note on Closed Degrees of Difficulty o
✍ Caterina Bianchini; Andrea Sorbi 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 351 KB

We consider some nonprincipal filters of the Medvedev lattice. We prove that the filter generated by the nonzero closed degrees of difficulty is not principal and we compare this filter, with respect to inclusion, with some other filters of the lattice. All the filters considered in this paper are d