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Positive Presentations of Families Relative to e-Oraclescomputably enumerable set

Enumeration of ideals of exceptional nilpotent matrix algebrasIn well-known enumerations of characteristic ideals of the algebra NT(n,K) of all (lower

The enumeration spectrum hierarchy of α-families and lowα degrees is the enumeration spectrum of a family from the hierarchy. In particular, we show that the collection of non

Some Properties of the Upper Semilattice of Computable Families of Computably Enumerable Sets families of computably enumerable sets in Ω. It is proved that ideals of minuend and finite families of Ω

Computable Linear Orders and the Ershov Hierarchy
exactly all n-computable enumerable degrees. We also study interconnections of these relations among

On computably enumerable structuresOn computably enumerable structures

Degrees of Enumerations of Countable Wehner-Like FamiliesDegrees of Enumerations of Countable Wehner-Like Families

A Glazman–Povzner–Wienholtz theorem on graphs to Schrödinger operators on graphs. We first obtain the corresponding theorem for Schrödinger operators on metric

There is no low maximal d. c. e. degree - CorrigendumComputably enumerable set

Irreducible, Singular, and Contiguous Degrees not settled for these. A computably enumerable Q-degree which consists of one computably enumerable m

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