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Paper   IPM / M / 512
School of Mathematics
  Title:   Rough polygroups
  Author(s):  B. Davvaz
  Status:   Published
  Journal: Ital. J. pure Appl. Math.
  Year:  2002
  Pages:   91-96
  Supported by:  IPM
In this paper we shall give some properties of the lower and upper approximations with respect to the normal subpolygroups of a polygroup. In particular, we shall introduce the notion of a rough subpolygroup.

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