Ali Akbar Estaji

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Keywords: Lattice Approximation space Rough set Ideal Filter Lower and upper approximations a b s t r a c t In this paper, we intend to study a connection between rough sets and lattice theory. We introduce the concepts of upper and lower rough ideals (filters) in a lattice. Then, we offer some of their properties with regard to prime ideals (filters), the(More)
In this paper, we introduce the notion of fuzzy primary subact and study some important properties. Finally, we show that a non-constant fuzzy subact µ of S-act A is a fuzzy P-primary subact of A if and only if for every fuzzy point a β of A and fuzzy point S α of S, if a s β α ∈µ  and a β ∈µ / , then S α ∈P and if S α ∈P, then there is an n∈N such that n(More)
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