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concerns the number of changes of sign of the kernel in the integral representation of the remainder in a general interpolatory formula when the system is a "normal" point system. For this purpose he has to classify the system of points according as they are "conservative" or "nonconservative." For greater details see [7]1. A more particular case n = 2 was treated directly by Polya when the system is not "normal" in the sense of Birkhoff. A similar case in

Convergence of interpolatory polynomials, (0,1,2,4) interpolation