Über die Abhängigkeit der Fehlerfunktion bei der rationalen Lp-Approximation von den Koeffizienten des Nennerpolynoms bei minimalem Zählerpolynom.
A universal optimal in order approximation of a general functional in the space of continuous periodic functions is constructed and its fundamental properties and some generalizations are investigated. As an application the approximation of singular integrals is considered and illustrated by numerical results.