A result on single valued neutrosophic refined rough approximation operators

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Following the idea of Bao and Yang, in this paper, let X be a set, Hn (X) and Ln (X) denote the family of all n-dimension single valued neutrosophic refined upper and lower approximation operators in X, respectively. We can define appropriate order relation ≦ on Hn (X) (resp., Ln (X)) such that both (Hn (X), ≦) and (Ln (X), ≦) are complete lattices. In particular, both (H, ≦) and (L, ≦) are complete lattices, where H and L denote the family of single valued neutrosophic upper and lower approximation operators in X, respectively.

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