Now, we can see that the function F(x, y, z) increasing in x, y and z. Then Bx + ax + - 1 (x - To) bx +c < [-(1-a- 8) z + ax (x- 0) < -(1-a-8-)-²

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter4: Eigenvalues And Eigenvectors
Section4.6: Applications And The Perron-frobenius Theorem
Problem 70EQ
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THEOREM 3.1. The equilibrium point To is a global attractor of difference equation (1) if
a
a +B+- < 1.
(5)
Proof: Suppose that ( and n are real numbers and assume that F: S,n13 IS, nl is a function defined by
F(r, y, z) = Br + ay +
bz+c
Then
ƏF(r, y, z)
= 3,
aF(r, y, 2)
= a and OF(x, y, z)
ас
%3D
(bz+c)? •
Now, we can see that the function F(x, y, z) increasing in x, y and z. Then
Bx + ax +
- x| (x – TO)
bx +c
[-(1-a - B)a +
(a - 0) s- (1-a-8-:)*<0
ax
- a -
bx
If a +B+ < 1, then F(x, y, z) satisfies the negative feedback property
[F(x, x, x) - ] (x- To) < 0, for To = 0.
Transcribed Image Text:THEOREM 3.1. The equilibrium point To is a global attractor of difference equation (1) if a a +B+- < 1. (5) Proof: Suppose that ( and n are real numbers and assume that F: S,n13 IS, nl is a function defined by F(r, y, z) = Br + ay + bz+c Then ƏF(r, y, z) = 3, aF(r, y, 2) = a and OF(x, y, z) ас %3D (bz+c)? • Now, we can see that the function F(x, y, z) increasing in x, y and z. Then Bx + ax + - x| (x – TO) bx +c [-(1-a - B)a + (a - 0) s- (1-a-8-:)*<0 ax - a - bx If a +B+ < 1, then F(x, y, z) satisfies the negative feedback property [F(x, x, x) - ] (x- To) < 0, for To = 0.
Our goal is to obtain some qualitative behavior of the positive solutions of the difference equation
Xn+1 = Bxn-i+axn-k +
axn-t
n = 0, 1, ...,
(1)
bxn-t+c'
where the parameters 3, a, a, b and c are positive real numbers and the initial conditions x-s, x-s+1, ..., x-1,
xo are positive real numbers where s = max{1, k, t}.
.D TT T T
Transcribed Image Text:Our goal is to obtain some qualitative behavior of the positive solutions of the difference equation Xn+1 = Bxn-i+axn-k + axn-t n = 0, 1, ..., (1) bxn-t+c' where the parameters 3, a, a, b and c are positive real numbers and the initial conditions x-s, x-s+1, ..., x-1, xo are positive real numbers where s = max{1, k, t}. .D TT T T
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