JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, cilt.319, sa.2, ss.410-423, 2006 (SCI-Expanded)
In this paper, we derive a Picone type formula for second-order linear non-selfadjoint impulsive differential equations having fixed moments of impulse actions, and obtain a Wirtinger type inequality, a Leighton type comparison theorem, and a Sturm-Picone comparison theorem for such equations. Moreover, several oscillation criteria are also derived as applications. (c) 2005 Elsevier Inc. All rights reserved.