id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ejpam-4734	Boonpok, Chawalit; Khampakdee, Jeeranunt	Upper and Lower weak $s\beta(\star)$-continuity	2023	13	.pdf	application/pdf	4725	363	82	Then F is said to be surjection if F (X) = Y , or equivalent, if for each y ∈ Y there exists x ∈ X such that y ∈ F (x) and F is called injection if x ̸= y implies F (x) ∩ F (y) = ∅. 3. In particular, F−(y) = {x ∈ X | y ∈ F (x)} for each point y ∈ Y .	cache/ejpam-4734.pdf	txt/ejpam-4734.txt