On the hybrid fractional differential equations with fractional proportional derivatives of a function with respect to a certain function

This paper deals with a new class of hybrid fractional differential equations with fractional proportional derivatives of a function with respect to a certain continuously differentiable and increasing function ϑ. By means of a hybrid fixed point theorem for a product of two operators, an existence result is proved. Furthermore, the sufficient conditions of the continuous dependence on the given parameters are investigated. Finally, a simulative example is given to highlight the acquired outcomes. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.