Operations Research : Applications and Algorithms
Operations Research : Applications and Algorithms
4th Edition
ISBN: 9780534380588
Author: Wayne L. Winston
Publisher: Brooks Cole
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Transcribed Image Text:Prove each statement using either weak, strong, or structural induction. Make sure to clearly indicate the
different parts of your proof: the basis step, the inductive hypothesis, what you will show in the inductive
step, and the inductive step. Make sure to clearly format your proofs and to write in complete, clear
sentences.
EXAMPLE: Prove that for any nonnegative integer n, Σ i = (n+1)
Answer:
Proof. (by weak induction)
Basis step: n = 1
Σ=1
1(1+1)==1
Therefore, (n+1) when n = 1.
=
Inductive hypothesis: Assume that
Inductive step: We will show that
i=1
i=1
i=
= (+1) for some integer k > 1.
i= (k+1)((k+1)+1)
k+1
Σ=Σ+ (κ + 1)
i=1
By inductive hypothesis,
k+1
Σ
IME
i=1
k(k+1)
=
+k+1
2
k(k+1)+2(k+1)
=
2
(k+2)(k+1)
=
2
(k+1)((k+1)+1)
2
Therefore, by weak induction, we have shown that = (n+1) for all nonnegative integers n.
Transcribed Image Text:Prove that 9" 2" is divisible by 7 for all positive integers n.
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