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Instable Trivial Solution of Autonomous Differential Systems with Quadratic Right-Hand Sides in a Cone

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  • D. Ya. Khusainov
  • J. Diblík
  • Z. Svoboda
  • Z. Šmarda

Abstract

The present investigation deals with global instability of a general ð ‘› -dimensional system of ordinary differential equations with quadratic right-hand sides. The global instability of the zero solution in a given cone is proved by Chetaev's method, assuming that the matrix of linear terms has a simple positive eigenvalue and the remaining eigenvalues have negative real parts. The sufficient conditions for global instability obtained are formulated by inequalities involving norms and eigenvalues of auxiliary matrices. In the proof, a result is used on the positivity of a general third-degree polynomial in two variables to estimate the sign of the full derivative of an appropriate function in a cone.

Suggested Citation

  • D. Ya. Khusainov & J. Diblík & Z. Svoboda & Z. Šmarda, 2011. "Instable Trivial Solution of Autonomous Differential Systems with Quadratic Right-Hand Sides in a Cone," Abstract and Applied Analysis, Hindawi, vol. 2011, pages 1-23, December.
    • Handle: RePEc:hin:jnlaaa:154916
    DOI: 10.1155/2011/154916
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