Journal of Function Spaces, vol.2021, 2021 (SCI-Expanded)
We study the existence of solutions for a newly configured model of a double-order integrodifferential equation including ϕ-Caputo double-order ϕ-integral boundary conditions. In this way, we use the Krasnoselskii and Leray-Schauder fixed point results. Also, we invoke the Banach contraction principle to confirm the uniqueness of the existing solutions. Finally, we provide three examples to illustrate our analytical findings.