Problem 8. Let an = Hn – In n, where H, is the nth harmonic number, defined by 1 Hn = 1+ 2 1 +- + 3 1 1 ... + - 1 k k=1 4 n n+1 dx (a) Show that an >0 for all n > 1. (Hint: Use a Riemann sum to show that Hn > (b) Show that an is decreasing. (Hint: Consider an an+1 to be an area.) (c) Show that lim an exists (you do not need to find this limit).

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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Problem 8. Let an = Hn – In n, where H, is the nth harmonic number, defined by
n
1
1
=1+
+
3
2
1
1
1
Hn
4
k
k=1
cn+1
dx
(a) Show that an >0 for all n > 1. (Hint: Use a Riemann sum to show that Hn >
1
(b) Show that an is decreasing. (Hint: Consider an
an+1 to be an area.)
(c) Show that lim an exists (you do not need to find this limit).
n→∞
Transcribed Image Text:Problem 8. Let an = Hn – In n, where H, is the nth harmonic number, defined by n 1 1 =1+ + 3 2 1 1 1 Hn 4 k k=1 cn+1 dx (a) Show that an >0 for all n > 1. (Hint: Use a Riemann sum to show that Hn > 1 (b) Show that an is decreasing. (Hint: Consider an an+1 to be an area.) (c) Show that lim an exists (you do not need to find this limit). n→∞
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