1. E. Egerváry andP. Turán, Notes on interpolation. V,Acta Math. Acad. Sci. Hung.,9 (1958), pp. 259–267.
2. L. Fejér, Über Interpolation,Gött. Nachr., (1916), pp. 1–26.
3. As Mr.J. Balázs remarked, one cannot replace 0 in the definition by $$\mathop {min}\limits_v (y_v - y_v^* )e^{ - x_{vn} } $$ as the exampley v =e x vn ,y v * =0 (v=1, 2,...,n) shows at once. Analogous remark holds for Definition II.
4. From our analysis it follows that for all realy v andy v * (i.e. not requiringy v ≧y v * ) the inequality holds forx≧0.
5. Again we obtained for all realy v andy v * (i. e. not requiringy v ≧y v * ) the inequality for all real valuesx.