id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ejde-194	Holubova, Gabriela	Optimal conditions for the maximum principle for second-order periodic problems	2023	10	.pdf	application/pdf	4053	267	78	Let p = p1 − p2 ∈ V−(ω), i.e., for any q ∈ Lω, q(t) ≥ 0, q 6≡ 0, the problem − u′′ + p1(t)u = p2(t)u− q(t), u(0) = u(ω), u′(0) = u′(ω) Thus p = p1 − p2 ∈ V−(ω).	cache/ejde-194.pdf	txt/ejde-194.txt