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Automorphisms and Recursive Structures

โœ Scribed by R. G. Downey; J. B. Remmel

Publisher
John Wiley and Sons
Year
1987
Tongue
English
Weight
470 KB
Volume
33
Category
Article
ISSN
0044-3050

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Ash and Nerode [2] gave natural definability conditions under which a relation is intrinsically r.e. Here we generalize this to arbitrary levels in Ershov's hierarchy of A: sets, giving conditions under which a relation is intrinsically a-r. e.

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AUTOMORPHISMS O F THE LATTICE OF RECURSIVELY ENUMERABLE VECTOR SPACES by IRAJ KALANTARI in Macomb, Illinois (U.S.A. ) l ) I ) This paper forms a part of the author's dissertation. We would like to acknowledge valuable discussions with GEORGE METAKIDES, ANU NERODE, ALLEN RETZLAFF and RICHARD SHORE. R