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Density of the Medvedev lattice of

โœ Scribed by Douglas Cenzer; Peter G. Hinman


Publisher
Springer
Year
2003
Tongue
English
Weight
226 KB
Volume
42
Category
Article
ISSN
0933-5846

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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