Let (an) 1 and (bn)-1 be two sequences of real numbers. Prove or disprove each of the following statements: (a) ( 1) If the sequence (an)n-1 is defined by the recursive formula an+1 = -2-a, a₁ = 1, then (an)n-1 converges. =1 (b) (-_ -) If an exist, then lim (an-bn) 0. 81x bn for every n N and lim an and lim bn do not 84x 84x (c) ( -) If for every sequence of real numbers (cn) for which lim Cn does not exist, we have lim (an+cn) does not exist, then 818 81x lim an exists. 818

Advanced Engineering Mathematics
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Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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5. Let (an) and (bn)-1 be two sequences of real numbers.
Prove or disprove each of the following statements:
(a) (*.
7) If the sequence (an)n-1 is defined by the recursive formula
an+1 = -2-a, a₁ = 1, then (an)=1 converges.
(b) (-_ -) If an
exist, then lim
81x
(c) {
-) If for every sequence of real numbers (Cn) for which
lim Cn does not exist, we have lim (an + Cn) does not exist, then
818
n4x
lim an exists.
nx
(d) (-- .
bn for every n E N and lim an and lim bn do not
(an-bn) 0.
n4x
818
If lim (a2n-an) = 0, then the sequence (an)n-1
)
84x
converges.
Transcribed Image Text:5. Let (an) and (bn)-1 be two sequences of real numbers. Prove or disprove each of the following statements: (a) (*. 7) If the sequence (an)n-1 is defined by the recursive formula an+1 = -2-a, a₁ = 1, then (an)=1 converges. (b) (-_ -) If an exist, then lim 81x (c) { -) If for every sequence of real numbers (Cn) for which lim Cn does not exist, we have lim (an + Cn) does not exist, then 818 n4x lim an exists. nx (d) (-- . bn for every n E N and lim an and lim bn do not (an-bn) 0. n4x 818 If lim (a2n-an) = 0, then the sequence (an)n-1 ) 84x converges.
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