International Journal of Mathematics and Mathematical Sciences
Volume 2012 (2012), Article ID 318214, 15 pages
Research Article

Approximations of Antieigenvalue and Antieigenvalue-Type Quantities

Mathematics Department, Indiana University East, Richmond, IN 47374, USA

Received 29 September 2012; Accepted 21 November 2012

Academic Editor: Feng Qi

Copyright © 2012 Morteza Seddighin. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We will extend the definition of antieigenvalue of an operator to antieigenvalue-type quantities, in the first section of this paper, in such a way that the relations between antieigenvalue-type quantities and their corresponding Kantorovich-type inequalities are analogous to those of antieigenvalue and Kantorovich inequality. In the second section, we approximate several antieigenvalue-type quantities for arbitrary accretive operators. Each antieigenvalue-type quantity is approximated in terms of the same quantity for normal matrices. In particular, we show that for an arbitrary accretive operator, each antieigenvalue-type quantity is the limit of the same quantity for a sequence of finite-dimensional normal matrices.