We use a method based on Picone-type identities to find oscillation conditions for the equation
with Dirichlet boundary conditions on bounded and unbounded domains. In this article, the above method substitudes the traditional Riccati techniques [3,8] used for unbounded domains.
Submitted September 10, 2009. Published April 9, 2010.
Math Subject Classifications: 35J60, 35J70.
Key Words: Picone's identity; semilinear elliptic equations.
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Mathematics Institut, Universitetsparken 5
2100 Copenhagen, Denmark
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