Open Access

Liouville Theorems for a Class of Linear Second-Order Operators with Nonnegative Characteristic Form

Boundary Value Problems20072007:048232

DOI: 10.1155/2007/48232

Received: 1 August 2006

Accepted: 29 November 2006

Published: 14 March 2007

Abstract

We report on some Liouville-type theorems for a class of linear second-order partial differential equation with nonnegative characteristic form. The theorems we show improve our previous results.

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Authors’ Affiliations

(1)
Dipartimento di Matematica, Università di Bologna

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Copyright

© A. E. Kogoj and E. Lanconelli 2007

This article is published under license to BioMed Central Ltd. 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.