Strongly Monotone Solutions of Retarded Differential Equations
Yiannis G. Sficas · Canadian Mathematical Bulletin · 1979
Let us consider the retarded differential equation 1 for which the following assumptions are made: (i) p: [t0, ∞) → [0, ∞) is continuous and not identically zero for all large t. (ii) σ [t0, ∞)→ ℝ is continuous, strictly increasing, (iii) φ: ℝ → ℝ is continuous, non-decreasing and