6n +3n = 3 2n² -5 (c) lim

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Section 4.1 • Convergenc=
1 EXERCISES
Exercises marked with * are used in later sections, and exercises marke
have hints or solutions in the back of the book.
1. Mark each statement Trục or False. Justify each answer.
(a) If (s,) is a sequence and s; =S, then i =j.
(b) If s, → s, then for every e> 0 there exists Ne N such that n2
|s, - s|< E.
(c) If s, → k and 1, → k, then s, = t, for allne N.
(d) Every convergent sequence is bounded.
2. Mark each statement True or False. Justify each answer.
(a) If s, → 0, then for every ɛ > 0 there exists Ne N such that n2.
Sn < E.
(b) If for every ɛ > 0 there exists Ne N such that n>N implies sm
S→ 0.
(c) Given sequences (s,) and (a,), if for some s e R, k> 0 and -
have |s, - s| < kla, for all n> m, then lim s, = s.
(d) If s, → s and s, →1, then s = t.
3. Write out the first seven terms of each sequence.
(-1)"
(b) b, =
(а) а, — п? *
(c) C, = coS
3
2n +1
(d) d, =
3n -1
4. Find k> () and m eN so that 6n' + 17n s kn' for all integers n2 m.
5. Find k> 0 and m e N so that n - 7n 2 kn' for all integers n2 m.
6. Using only Definition 4.1.2, prove the following.
(a) For any real number k, lim, z (k/n) = 0.
*(b) For any real number k > 0, lim,, →» (1/n) = 0.
(d) lim sin n
= 0
4n+1
(c) lim
= 4
n+3
(e) lim
n+3
= 0
(f) lim-
= 0
n +n-3
n+2
-13
7. Using any of the results in this section, prove the following.
5n - 6
1
(а) lim-
(b) lim
03-
2n - 7n
2+3n
0 =
6n +3n
= 3
=0 *
n+1
(с) lim
(d) lim
2n -5
Transcribed Image Text:Section 4.1 • Convergenc= 1 EXERCISES Exercises marked with * are used in later sections, and exercises marke have hints or solutions in the back of the book. 1. Mark each statement Trục or False. Justify each answer. (a) If (s,) is a sequence and s; =S, then i =j. (b) If s, → s, then for every e> 0 there exists Ne N such that n2 |s, - s|< E. (c) If s, → k and 1, → k, then s, = t, for allne N. (d) Every convergent sequence is bounded. 2. Mark each statement True or False. Justify each answer. (a) If s, → 0, then for every ɛ > 0 there exists Ne N such that n2. Sn < E. (b) If for every ɛ > 0 there exists Ne N such that n>N implies sm S→ 0. (c) Given sequences (s,) and (a,), if for some s e R, k> 0 and - have |s, - s| < kla, for all n> m, then lim s, = s. (d) If s, → s and s, →1, then s = t. 3. Write out the first seven terms of each sequence. (-1)" (b) b, = (а) а, — п? * (c) C, = coS 3 2n +1 (d) d, = 3n -1 4. Find k> () and m eN so that 6n' + 17n s kn' for all integers n2 m. 5. Find k> 0 and m e N so that n - 7n 2 kn' for all integers n2 m. 6. Using only Definition 4.1.2, prove the following. (a) For any real number k, lim, z (k/n) = 0. *(b) For any real number k > 0, lim,, →» (1/n) = 0. (d) lim sin n = 0 4n+1 (c) lim = 4 n+3 (e) lim n+3 = 0 (f) lim- = 0 n +n-3 n+2 -13 7. Using any of the results in this section, prove the following. 5n - 6 1 (а) lim- (b) lim 03- 2n - 7n 2+3n 0 = 6n +3n = 3 =0 * n+1 (с) lim (d) lim 2n -5
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