Abstract
We prove the existence of continuously differentiable solutions with required asymptotic properties as t → +0 and determine the number of solutions of the following Cauchy problem for a functional differential equation:
where α: (0, τ) → (0, +∞), g: (0, τ) → (0, +∞), and h: (0, τ) → (0, +∞) are continuous functions, 0 < g(t) ≤ t, 0 < h(t) ≤ t, t ∈ (0, τ), \(\begin{gathered} \alpha \left( t \right)x\prime \left( t \right) = at + b_1 x\left( t \right) + b_2 x\left( {g\left( t \right)} \right) + \phi \left( {t,x\left( t \right),x\left( {g\left( t \right)} \right),x\prime \left( {h\left( t \right)} \right)} \right),\quad x\left( 0 \right) = 0, \hfill \\ \mathop {\lim }\limits_{t \to + 0} \alpha \left( t \right) = 0 \hfill \\ \end{gathered}\), and the function ϕ is continuous in a certain domain.
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Zernov, A.E. On the Solvability and Asymptotics of Solutions of One Functional Differential Equation with Singularity. Ukrainian Mathematical Journal 53, 514–527 (2001). https://doi.org/10.1023/A:1012318403151
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DOI: https://doi.org/10.1023/A:1012318403151