Approximations in (bi-)hyperideals of Semihypergroups

نویسندگان

  • R. Ameri
  • S. Azizpour Arabi
  • H. Hedayati
چکیده

We consider the fundamental relation on a semihypergroup to interpret the lower and upper approximations as subsets of the fundamental semigroup / and we give some results in this connection. Also, we introduce the notion of a bi-hyperideal to study the relationship between approximations and bi-hyperideals.

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تاریخ انتشار 2013