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  • 學位論文

複數係數多項式的穩定域與振動域

Stability Regions and Oscillation Regions for Complex Polynomials

指導教授 : 鄭穗生
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摘要


在這篇文章裡面,我們在第一部分想要去發現讓一個三次複數係數多項式所有根的絕對值都小於1的一些條件,這裡我們將從二次多項式討論到三次多項式。第二部分,我們想要去發現讓一個四次複數係數多項式所有的根都是非正根的一些條件,我們將從二次多項式討論到四次多項式。

關鍵字

穩定 振動

並列摘要


In this thesis, we find necessary and sufficient conditions for the roots of a cubic polynomial with complex coefficients to lie inside the unit disk, and find necessary and sufficient conditions for the roots of a quartic polynomial with complex coefficients to lie in the complement of the positive x

並列關鍵字

stability Oscillation

參考文獻


[1].G. Gandolfo, Economic Dynamics, Springer, 1996.
[2].R. J. Duffin, Algorithms for classical stability problems, problems, SIAM Review, 11(2)1969, 196-213.
[4].S. S. Cheng and S. S. Chiou, Exact stability regions for quartic polynomials, J. Brazilean Math. Soc., to appear.
[5].S. A. Kuruklis, The asymptotic stability of $x_{n+1}-ax_{n}+bx_{n-k}=0,$ J. Math. Anal. Appl., 188(1994), 719-731.
[6].V. G. Papancolaou, On the asymptotic stability of a class of linear difference equations, Math. Magazine, 69(1)(1996), 34--43.

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