6n +3n = 3 2n2-5 c] lim sin n)

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Math 4303 Homework Section 4.1 Convergence
1. Write out the first seven terms of the sequence dn
2n +1
%3D
3n-1
2. Using only Definition 4.1.2 (N-ɛ definition of convergence), prove the following:
k
a] lim
- = 0
kER
4n +1
b] lim
no n+3
= 4
6n? +3n
= 3
no 2n? -5
c] lim
sin( n)
=D0
d] lim
3. Prove or provide a counterexample for the following:
a] If (s,) converges then (s) converges.
b] If (s,) converges then (s,) converges.
c] lim s, = 0 iff lim |s„ =0
4. Suppose that lim s, =0 and suppose that (t, ) is a bounded sequence. Show that lim s,t, = 0
5. Suppose that (x,), (y, ), and (=,) are sequences such that x, Sy, S=, n and lim x, = L = lim =
Show that lim y, = L
6. Suppose that lim s. =s where s > 0. Prove that there exists a natural number N, such that
if n> N, then s, > 0
DFocus
DELL
Transcribed Image Text:Math4303Sec4_1Homework Protected View - Saved to this PC - O Search gn Layout References Mailings Review View Help e Internet can contain viruses. Unless you need to edit, it's safer to stay in Protected View. Enable Editing Math 4303 Homework Section 4.1 Convergence 1. Write out the first seven terms of the sequence dn 2n +1 %3D 3n-1 2. Using only Definition 4.1.2 (N-ɛ definition of convergence), prove the following: k a] lim - = 0 kER 4n +1 b] lim no n+3 = 4 6n? +3n = 3 no 2n? -5 c] lim sin( n) =D0 d] lim 3. Prove or provide a counterexample for the following: a] If (s,) converges then (s) converges. b] If (s,) converges then (s,) converges. c] lim s, = 0 iff lim |s„ =0 4. Suppose that lim s, =0 and suppose that (t, ) is a bounded sequence. Show that lim s,t, = 0 5. Suppose that (x,), (y, ), and (=,) are sequences such that x, Sy, S=, n and lim x, = L = lim = Show that lim y, = L 6. Suppose that lim s. =s where s > 0. Prove that there exists a natural number N, such that if n> N, then s, > 0 DFocus DELL
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