(Requires calculus) Let Hn be the nth harmonic number
Show that Hn is O(log n). [Hint: First establish the inequality
by showing that the sum of the areas of the rectangles of height 1/j with base from j − 1 to j. for j = 2, 3,..., n, is less than the area under the curve y = 1/x from 2 to n.]
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