2 The local stability of the solutions The equilibrium point x of Eq.(1) is the positive solution of the equation ã= (A+B+C+D) x+ (6) (d- e)x' where d+ e. If [(A+B+C+D) – 1] (e – d) > 0, then the only positive equilibrium point ĩ of Eq.(1) is given by b X= [(A+B+C+D) - 1] (e – d) (7) Let us now introduce a continuous function F: (0,00)4 → (0, 0) which is defined by buj F(u0, u1, 2, u3)= Auo+ Bu + Cu2 + Du3 + %3D (du – euz) (8) provided du # euz. Consequently, we get ƏF(x,X,x,X) = A= Po, %3D One e [(A+B+C+D) –1] (e – d) ƏF(x,X,XX) = B– = P1, (9) e[(A+B+C+D) –1] (e – d) ƏF(x,X,X,X) = P2, Zne ƏF(x,x,X,X) D= P3, where e+ d. Thus, the linearized equation of Eq.(1) about x takes the form Zn+1 - Pozn- P1Zn-k- P2Zn-1- P3Zn-o = 0, (10) %3D where po, P1, P2 and p3 are given by (9).
2 The local stability of the solutions The equilibrium point x of Eq.(1) is the positive solution of the equation ã= (A+B+C+D) x+ (6) (d- e)x' where d+ e. If [(A+B+C+D) – 1] (e – d) > 0, then the only positive equilibrium point ĩ of Eq.(1) is given by b X= [(A+B+C+D) - 1] (e – d) (7) Let us now introduce a continuous function F: (0,00)4 → (0, 0) which is defined by buj F(u0, u1, 2, u3)= Auo+ Bu + Cu2 + Du3 + %3D (du – euz) (8) provided du # euz. Consequently, we get ƏF(x,X,x,X) = A= Po, %3D One e [(A+B+C+D) –1] (e – d) ƏF(x,X,XX) = B– = P1, (9) e[(A+B+C+D) –1] (e – d) ƏF(x,X,X,X) = P2, Zne ƏF(x,x,X,X) D= P3, where e+ d. Thus, the linearized equation of Eq.(1) about x takes the form Zn+1 - Pozn- P1Zn-k- P2Zn-1- P3Zn-o = 0, (10) %3D where po, P1, P2 and p3 are given by (9).
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Given continuous function ,
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