This work aims to investigate the equilibria, local stability, global attractivity and the exact solutions of the following difference equations Bun-1un-5 Un+1 = aun-1+ n = 0,1, ..., (1) YUn-3 - dun-5 Bun-1un-5 Un+1 = QUn-1 n = 0,1, ..., (2) %3D YUn-3 + dun-5 where the coefficients a, B, y, and & are positive real numbers and the initial con- ditions u; for all i = -5, -4, .., 0, are arbitrary non-zero real numbers. We also present the numerical solutions via some 2D graphs. 2. ON THE EQUATION Un+1 = aUn-1+ Bun-1un-5 yun-3-dun-5 This section is devoted to study the qualitative behaviors of Eq. (1). The equilibrium point of Eq. (1) is given by

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section9.1: Systems Of Equations
Problem 6E
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This work aims to investigate the equilibria, local stability, global attractivity
and the exact solutions of the following difference equations
Bun-1un-5
Un+1 = aUn-1+
n = 0,1, ..,
(1)
YUn-3 - dun-5'
Bun-1un-5
Un+1 = aUn-1-
n = 0,1, ..,
(2)
YUn-3 + dun-5'
where the coefficients a, B, y, and & are positive real numbers and the initial con-
ditions ui for all i = -5, -4, .., 0, are arbitrary non-zero real numbers. We also
present the numerical solutions via some 2D graphs.
2. ON THE EQUATION Un+1 = aUn-1 +
Bun-1un-5
Yun-3-dun-5
(1). The
This section is devoted to study the qualitative behaviors of Eq.
equilibrium point of Eq. (1) is given by
6. EXACT SOLUTION OF EQ. (1) WHEN a =
B=y= 8 = 1
In this section, we investigate the exact solutions of the following rational differ-
ence equation
Un-1un-5
Иn+1 — ит-1 +
n = 0, 1, ...,
(10)
Un-3 - Un-5
where the initial conditions are positive real numbers.
Theorem 5 Let {un}n=-5
be a solution to Eq. (10) and suppose that u-5 =
d, u-1 = e, uo = f. Then, for n = 0, 1,2, .., the
а, и-4 — б, и_з — с, и-2 —
solutions of Eq. (10) are given by the following formulas:
e2n c"
U8n-5 =
(c- e)"(a – c)n'
f2n d"
bn-1(d - f)"(b– d)n'
cn+le2n
n-1
U8n-4 =
U8n-3 =
a" (a – c)" (c – e)"'
dn+1 f2n
b" (b – d)" (d- f)"'
e2n+1cn
U8n-2 =
U8n-1 =
a" (a – c)"(c – e)* '
f2n+1gn
br (b – d)"(d – f)"'
cn+1 e2n+1
U8n
U8n+1
a" (c - e)" (a – c)n+1>
dn+1 f2n+1
b" (d – f)"(b – d)n+1*
U8n+2 =
Proof.
It can be easily observed that the solutions are true for n = 0. We now
assume that n > 0 and that our assumption holds for n – 1. That is,
e2n-2 cn-1
n-2(c – e)n-1(a – c)n-1'
f2n-2 an-1
b2-2 (d – f)n-1(b – d)a-I?
U8n-13 =
U8n-12 =
c"e2n-2
U8n-11
n-1(a - c)a-1(c – e)n–1'
an-1
Transcribed Image Text:This work aims to investigate the equilibria, local stability, global attractivity and the exact solutions of the following difference equations Bun-1un-5 Un+1 = aUn-1+ n = 0,1, .., (1) YUn-3 - dun-5' Bun-1un-5 Un+1 = aUn-1- n = 0,1, .., (2) YUn-3 + dun-5' where the coefficients a, B, y, and & are positive real numbers and the initial con- ditions ui for all i = -5, -4, .., 0, are arbitrary non-zero real numbers. We also present the numerical solutions via some 2D graphs. 2. ON THE EQUATION Un+1 = aUn-1 + Bun-1un-5 Yun-3-dun-5 (1). The This section is devoted to study the qualitative behaviors of Eq. equilibrium point of Eq. (1) is given by 6. EXACT SOLUTION OF EQ. (1) WHEN a = B=y= 8 = 1 In this section, we investigate the exact solutions of the following rational differ- ence equation Un-1un-5 Иn+1 — ит-1 + n = 0, 1, ..., (10) Un-3 - Un-5 where the initial conditions are positive real numbers. Theorem 5 Let {un}n=-5 be a solution to Eq. (10) and suppose that u-5 = d, u-1 = e, uo = f. Then, for n = 0, 1,2, .., the а, и-4 — б, и_з — с, и-2 — solutions of Eq. (10) are given by the following formulas: e2n c" U8n-5 = (c- e)"(a – c)n' f2n d" bn-1(d - f)"(b– d)n' cn+le2n n-1 U8n-4 = U8n-3 = a" (a – c)" (c – e)"' dn+1 f2n b" (b – d)" (d- f)"' e2n+1cn U8n-2 = U8n-1 = a" (a – c)"(c – e)* ' f2n+1gn br (b – d)"(d – f)"' cn+1 e2n+1 U8n U8n+1 a" (c - e)" (a – c)n+1> dn+1 f2n+1 b" (d – f)"(b – d)n+1* U8n+2 = Proof. It can be easily observed that the solutions are true for n = 0. We now assume that n > 0 and that our assumption holds for n – 1. That is, e2n-2 cn-1 n-2(c – e)n-1(a – c)n-1' f2n-2 an-1 b2-2 (d – f)n-1(b – d)a-I? U8n-13 = U8n-12 = c"e2n-2 U8n-11 n-1(a - c)a-1(c – e)n–1' an-1
U8n-2u8n-6
U8n = U8n-2 +
U8n-4 - Ug8n-6
d" f2n-1
bn–1(d-f)n-1 (b-d)n
dn+1 f2n
dn+1 f2n
b" (b – d)" (d – f)"
b" (b-d)"(d- f)"
+
f2n dn
F)" (b-d)"
d" f2n
dn f2n-1
bn-1 (d-f)n-1 (b-d)"
bn-1(d
+
dn+1 f2n
b" (b – d)" (d – f)"
d" f2n+1
br (b – d)" (d – f)"*
br (b – d)"(d – f)n-1
Other solutions can be similarly proved.
Transcribed Image Text:U8n-2u8n-6 U8n = U8n-2 + U8n-4 - Ug8n-6 d" f2n-1 bn–1(d-f)n-1 (b-d)n dn+1 f2n dn+1 f2n b" (b – d)" (d – f)" b" (b-d)"(d- f)" + f2n dn F)" (b-d)" d" f2n dn f2n-1 bn-1 (d-f)n-1 (b-d)" bn-1(d + dn+1 f2n b" (b – d)" (d – f)" d" f2n+1 br (b – d)" (d – f)"* br (b – d)"(d – f)n-1 Other solutions can be similarly proved.
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