id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ejde-269	Dix, Julio G.	Improved oscillation criteria for first-order delay differential equations with variable delay	2021	13	.pdf	application/pdf	5110	350	84	= ∫ t t∗ p(s1) ∫ τ(t) τ(s1) p(s2) ∫ τ2(t) τ(s2) p(s3)· · · ∫ τn−1(t) τ(sn−1) p(sn) dsn . . . For the basic step n = 2, we have∫ t t∗ p(s1) ∫ τ(t) τ(s1) p(s2) ds2 ds1 ≥ ω ∫ t t∗ p(s1) ∫ t s1 p(s2) ds2 ds1 = ω 2! (∫ t t∗ p(s) ds )2 , where the equality follows from Lemma 2.1.	cache/ejde-269.pdf	txt/ejde-269.txt