... gt ≡ 0, then x 0 t ≡ 0; if gt/≡ 0, let l ρ maxt∈ 0, 1gt, then l> ;0. It is easy to prove that 0 ≤ x 0 t≤lρ1 0 Gt, tds lht.2.18Hence, 0 ≤ x 0 ≤ lh. Finally, ... 1–8, 200 4. 10 N. Yazidi, “Monotone method for singular Neumann problem,” Nonlinear Analysis: Theory, Methods &Applications, vol. 49, no. 5, pp. 589– 602 , 200 2.11 C B. Zhai, C. Yang, and ... x for t ∈ 0, 1,H3 for any t ∈ 0, 1,ft, a > 0, where a 1/2ch m 1. In the following, we will work in the Banach space C 0, 1 and only the sup-norm isused. Set P {x ∈ C 0, ...