Explanation Given information: Define a sequence c 1 , c 2 , c 3 , .... , recursively as follows: c 1 = 0 c k = 2 c ⌊ k / 2 ⌋ + k , for all integers k ≥ 2. Proof: PROOF BY STRONG INDUCTION: Let P ( n ) be " c n ≤ n 2 " Basis step: n = 1 c n = c 1 = 0 ≤ 1 = 1 2 = n 2 Thus P (1) is true. INDUCTIVE STEP: Let P ( 1 ) , P ( 2 ) , ... , P ( k ) be true, thus c i = ≤ i 2 for i = 1 , 2 , ... , k and let k ≥ 2. We need to prove that P ( k + 1 ) is true. First case: k odd Since k is odd, k + 1 is even and thus ( k + 1 ) / 2 is an integer. c k + 1 = 2 c ⌊ ( k + 1 ) / 2 ⌋ + k c k = 2 c ⌊ k / 2 ⌋ + k = 2 c ( k + 1 ) / 2 + 2 ( k + 1 ) / 2 is an integer ≤ 2 ⋅ ( ( k + 1 ) / 2 ) 2 + 2 P ( ( k + 1 ) / 2 ) is true = 2 ⋅ ( k + 1 ) 2 4 + 2 = k 2 + 2 k + 1 2 + 2 ( a + b ) 2 = a 2 + 2 a b + b 2 = k 2 2 + k + 3 2 ≤ k 2 2 + k 2 2 + 3 2 2 k ≤ k 2 when k ≥ 2 = k 2 + 3 2 ≤ k 2 + 2 &

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ISBN: 9780357035283

Author: EPP

Publisher: Cengage

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Sequence and Series

A sequence is defined as a collection of things. Series is defined to sum the things one by one in the sequence. It was invented by German mathematician Carl Friedrich Gauss.

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Chapter 11.4, Problem 23ES

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To prove:

Show that cn≤n2 for all integers n≥1.

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Chapter 11.4, Problem 22ES

Chapter 11.4, Problem 24ES

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