id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ejpam-5253	Al-Rehili, Amjad	Theoretical Foundations of h-Rough Sets	2024	14	.pdf	application/pdf	5322	506	82	Since we have K ⊆ K ∪ Q and Q ⊆ K ∪ Q. Then Rh(K) ⊆ Rh(K ∪ Q) and Rh(Q) ⊆ Rh(K ∪Q) by (iii) in Proposition 7, then Rh(K ∪Q) ⊇ Rh(K) ∪Rh(Q). Additionally, K is open iff K = K◦.	cache/ejpam-5253.pdf	txt/ejpam-5253.txt