Nonlocal Boundary Value Problem for Generalized Hilfer Implicit Fractional Differential Equations

In this paper, we derive the equivalent fractional integral equation to the nonlinear implicit fractional differential equations involving $\varphi$-Hilfer fractional derivative subject to nonlocal fractional integral boundary conditions. The existence of a solution, Ulam-Hyers, and Ulam-Hyers-Rassias stability has been acquired by means equivalent fractional integral equation. Our investigations depend on the fixed point theorem due to Krasnoselskii and the Gronwall inequality involving $\varphi$-Riemann--Liouville fractional integral. An example is provided to show the utilization of primary outcomes.