ÜBER POSITIVE QUADRATURFORMELN MIT MINIMALEM STÜTZSTELLENABSTAND
For given weight-function w>0 and given r € K we consider the distance D between the smallest and the greatest node of every positivequadrature formula of degree r. We show that there exists one and only one formula Q which minimizes D and prove a simple characterization of 0. In particular, we generalize results recently proven by H.Engels and S.A. Marschen [2]. AMS-Classification : 41A 55, 65 D30