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Paper   IPM / M / 89
School of Mathematics
  Title:   On a class of recursively enumerable sets
  Author(s):  F. Didehvar
  Status:   Published
  Journal: Math. Logic Quart.
  No.:  4
  Vol.:  45
  Year:  1999
  Pages:   467-470
  Supported by:  IPM
  Abstract:
We define a class of so-called Σ(n)-sets as a natural closure of recursively enumerable sets Wn under the relation "ϵ" and study its properties.

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