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A new approach to the problem of the zero distribution of Hermite-Pad\'epolynomials of type I for a pair of functions $f_1,f_2$ forming a Nikishinsystem is discussed. Unlike the traditional vector approach, we give an answerin terms of a scalar equilibrium problem with harmonic external field, which isposed on a two-sheeted Riemann surface.

On a new approach to the problem of the zero distribution of Hermite-Pad\'e polynomials for a Nikishin system