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$\varphi $-Hilfer fractional differential system in Banach spaces
In this work, we study the existence of solutions of nonlinear fractional coupled system of 
$\varphi $-Hilfer type in the frame of Banach spaces. We improve a property of a measure of noncompactness in a suitably selected Banach space. Darbo’s fixed point theorem is applied to obtain a new existence result. Finally, the validity of our result is illustrated through an example.
