Theorem 4 Every solution of Eq.(1) is bounded if a < 1. Proof: Let {an} -4 be a solution of Eq.(1). It follows from Eq.(1) that bæn-1+ can-2 + fæn-3+ rxn-4 Xn+1 = axn + dæn-1 + exn-2 + gæn-3 + sæn-4 bæn-1 dxn-1 + exn-2 + gæn-3 + sxn-4 axn + can-2 + dæn-1+ exn-2 + gæn-3 + san-4 fæn-3 + dæn-1 + exn-2 + gæn-3 + sxn-4 ran-4 dxn-1 + exn-2 + gæn-3 + 8æn-4 Then bæn-1 fæn-3 rxn-4 f cXn-2 an+1

Algebra & Trigonometry with Analytic Geometry
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ISBN:9781133382119
Author:Swokowski
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Chapter10: Sequences, Series, And Probability
Section: Chapter Questions
Problem 63RE
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Show me the steps of determine blue

The objective of this article is to investigate some qualitative behavior of
the solutions of the nonlinear difference equation
bxn-1 + cxn-2 + fxn-3 +rxn-4
Xn+1 = axn +
n = 0, 1, 2, .. (1)
dxn-1+ exn-2+ gxn-3 + sxn-4
where the coefficients a b cde fa rs E (0 o) while the initial con-
Transcribed Image Text:The objective of this article is to investigate some qualitative behavior of the solutions of the nonlinear difference equation bxn-1 + cxn-2 + fxn-3 +rxn-4 Xn+1 = axn + n = 0, 1, 2, .. (1) dxn-1+ exn-2+ gxn-3 + sxn-4 where the coefficients a b cde fa rs E (0 o) while the initial con-
Theorem 4 Every solution of Eq.(1) is bounded if a < 1.
Proof: Let {xn}- be a solution of Eq.(1). It follows from Eq.(1) that
n=-4
bxn-1 + can-2 + fæn-3 + ræn-4
Xn+1
axn +
dxn-1 + exn-2+ gxn-3 + sxn-4
bxn-1
axn +
dæn-1 + exn-2+ gxn-3+ sxn-4
can-2
dxn-1+ exn-2 + gan-3 + sxn-4
fæn-3
dxn-1+ exn-2 + gan-3 + sxn-4
rxn-4
dxn-1+ exn-2+ gxn-3 + sxn-4
Then
bæn-1
fæn-3
b
= axn +
+
d
cXn-2
rxn-4
f
Xn+1 < axn +
dxn-1
exn-2
gan-3
sxn-4
e
for all
n > 1.
By using a comparison, we can write the right hand side as follows
Уп+1 — ауn+
d
+
e
then
Yn = a"yo + constant,
and this equation is locally asymptotically stable because a < 1, and con-
verges to the equilibrium point
begs + cdgs + def s+ rdeg
y =
degs (1 – a)
Therefore
begs + cdgs + def s+ rdeg
lim sup an
degs (1 – a)
Thus, the solution of Eq.(1) is bounded and the proof is now completed.
Transcribed Image Text:Theorem 4 Every solution of Eq.(1) is bounded if a < 1. Proof: Let {xn}- be a solution of Eq.(1). It follows from Eq.(1) that n=-4 bxn-1 + can-2 + fæn-3 + ræn-4 Xn+1 axn + dxn-1 + exn-2+ gxn-3 + sxn-4 bxn-1 axn + dæn-1 + exn-2+ gxn-3+ sxn-4 can-2 dxn-1+ exn-2 + gan-3 + sxn-4 fæn-3 dxn-1+ exn-2 + gan-3 + sxn-4 rxn-4 dxn-1+ exn-2+ gxn-3 + sxn-4 Then bæn-1 fæn-3 b = axn + + d cXn-2 rxn-4 f Xn+1 < axn + dxn-1 exn-2 gan-3 sxn-4 e for all n > 1. By using a comparison, we can write the right hand side as follows Уп+1 — ауn+ d + e then Yn = a"yo + constant, and this equation is locally asymptotically stable because a < 1, and con- verges to the equilibrium point begs + cdgs + def s+ rdeg y = degs (1 – a) Therefore begs + cdgs + def s+ rdeg lim sup an degs (1 – a) Thus, the solution of Eq.(1) is bounded and the proof is now completed.
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