Vol. 23 (2012)

Volume 23-2012

• General ω-hyperstructures and certain applications of those

  Jan Chvalina, Sarka Hoskova-Mayerova

  3-20

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• (Intuitionistic) Fuzzy Grade of a Hypergroupoid: A Survey of Some Recent Researches

  Irina Cristea

  21-38

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• Hv-semigroups as noise pollution models in urban areas

  Achilles Dramalidis, Thomas Vougiouklis

  39-50

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• EL-hyperstructures: an overview

  Michal Novak

  65-80

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• Closed, Re exive, Invertible, and Normal Subhypergroups of Special Hypergroups

  Pavlina Rackova

  81-86

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• Directed Graphs representing isomorphism classes of C-Hypergroupoids

  Antonios Kalampakas, Stefanos Spartalis, Kassiani Skoulariki

  51-64

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