Badaev S. A., Podzorov S. Yu.
          Minimal coverings in the Rogers semilattices of Σ n0-computable 
          numberings
        Under study is the problem of existence of minimal and strong minimal 
          coverings in Rogers semilattices of Σ n0-computable 
          numberings for n≥2. Two sufficient conditions for existence of minimal 
          coverings and one sufficient condition for existence of strong minimal 
          coverings are found. The problem is completely solved of existence of 
          minimal coverings in Rogers semilattices of Σ n0-computable 
          numberings of a finite family.