Mild solutions of a class of semilinear fractional integro-differential equations subjected to noncompact nonlocal initial conditions

  • Abdeldjalil Aouane Département de Sciences Exactes et Informatique, École Normale Supérieure, Constantine, Algeria. – Laboratoire Théorie du Point Fixe et Applications ENS, BP 92 Kouba, Algiers, 16006. Algeria.
  • Smaïl Djebali Department of Mathematics, Faculty of Sciences, Imam Mohammad Ibn Saud Islamic University (IMSIU), PB 90950. Riyadh 11623, Saudi Arabia. – Laboratoire Théorie du Point Fixe et Applications ENS, BP 92 Kouba, Algiers, 16006. Algeria.
  • Mohamed Aziz Taoudi Cadi Ayyad University, National School of Applied Science Marrakesh, Morocco.
Keywords: Cosine operator, fractional integro-differential operator, abstract differential equation, noncompact nonlocal condition


In this paper, we prove the existence of mild solutions of a class of fractional semilinear integro-differential equations of order \(\beta\in(1,2]\) subjected to noncompact initial nonlocal conditions. We assume that the linear part generates an arbitrarily strongly continuous \(\beta\)-order fractional cosine family, while the nonlinear forcing term is of Carathéodory type and satisfies some fairly general growth conditions. Our approach combines the Monch fixed point theorem with some recent results regarding the measure of noncompactness of integral operators. Our conclusions improve and generalize many earlier related works. An example is provided to illustrate the main results.


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How to Cite
A. Aouane, S. Djebali, and M. A. Taoudi, “Mild solutions of a class of semilinear fractional integro-differential equations subjected to noncompact nonlocal initial conditions”, CUBO, A Mathematical Journal, vol. 22, no. 3, pp. 361–377, Dec. 2020.