On the oscillation of nonlinear two-dimensional differential systems

Kordonis, I.-G.; Philos, Ch.

doi:10.1090/S0002-9939-98-04503-1

On the oscillation of nonlinear two-dimensional differential systems
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by I.-G. E. Kordonis and Ch. G. Philos PDF

Proc. Amer. Math. Soc. 126 (1998), 1661-1667 Request permission

Abstract:

An oscillation criterion is given for a certain form of nonlinear two–dimensional differential systems. This criterion originated in a well-known oscillation result due to Coles (as extended and improved by Wong) concerning second order nonlinear differential equations with alternating coefficients.

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