%0 Journal Article
%T An infinite-dimensional generalization of Zenger's lemma
%A Roman Drnov\vsek
%J Mathematics
%D 2011
%I arXiv
%R 10.1016/j.jmaa.2011.11.018
%X We prove an infinite-dimensional generalization of Zenger's lemma that was used in the proof of the fact that the convex hull of the point spectrum of a linear operator is contained in its numerical range. Two relevant examples are given, and possible application in the Arrow-Debreu model is also discussed.
%U http://arxiv.org/abs/1111.2734v1