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This paper is concerned with the existence and uniqueness of positive solutions fora Volterra nonlinear fractional system of integral equations. Our analysis relies on a fixed pointtheorem of a sum operator. The conditions for the existence and uniqueness of a positive solutionto the system are established. Moreover, an iterative scheme is constructed for approximatingthe solution. The case of quadratic system of fractional integral equations is also considered

A Sum Operator Method for the Existence and Uniqueness of Positive Solutions to a System of Nonlinear Fractional Integral Equations