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Abstract
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Boundary Value Problems
Volume 2007 (2007), Article ID 48232, 16 pages
doi:10.1155/2007/48232

Liouville theorems for a class of linear second-order operators with nonnegative characteristic form

Alessia Elisabetta Kogoj and Ermanno Lanconelli

Dipartimento di Matematica, Università di Bologna, Piazza di Porta San Donato 5, Bologna 40126, Italy

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.