This paper presents sufficient conditions on the function to ensure that every solution of partial differential equation
is weakly oscillatory, i.e. has zero outside of every ball in . The main tool is modified Riccati technique developed for Schrodinger operator by Noussair and Swanson .
Submitted May 24, 2001. Published March 8, 2002.
Math Subject Classifications: 35B05
Key Words: Oscillation criteria, nonlinear oscillation, unbounded domains.
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|Robert Marik |
Dept. of Mathematics, Mendel University
613 00 Brno, Czech Republic
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