We introduced -fuzzy ideals, -fuzzy interior ideals, -fuzzy quasi-ideals, and -fuzzy bi-ideals of an ordered semigroup and studied them. When and , we meet the ordinary fuzzy ones. This paper can be seen as a generalization of Kehayopulu and Tsingelis (2006), Kehayopulu and Tsingelis (2007), and Yao (2009).
Yuming Feng. P. Corsini. "-Fuzzy Version of Ideals, Interior Ideals, Quasi-Ideals, and Bi-Ideals." J. Appl. Math. 2012 1 - 7, 2012. https://doi.org/10.1155/2012/425890