科研之友
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摘要
In this paper, we present some new oscillation criteria for the second-order nonlinear elliptic differential equation del . (A (x) del y) q (x) f (y) = e(x), X is an element of Omega, where Omega is an exterior domain in R-N. These criteria are different from most known ones in the sense that they are based on the information only on a sequence of annuals of Omega in R-N, rather than on the whole exterior domain Omega. Also information about the distribution of the zero of solutions is obtained.
