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Chapter 5 Number Theory © 2008 Pearson Addison-Wesley. All rights reserved
© 2008 Pearson Addison-Wesley. All rights reserved Chapter 5: Number Theory 5.1 Prime and Composite Numbers 5.2 Selected Topics From Number Theory 5.3 Greatest Common Factor and Least Common Multiple 5.4 The Fibonacci Sequence and the Golden Ratio
© 2008 Pearson Addison-Wesley. All rights reserved Chapter 1 Section 5-4 The Fibonacci Sequence and the Golden Ratio
© 2008 Pearson Addison-Wesley. All rights reserved The Fibonacci Sequence and the Golden Ratio The Fibonacci Sequence The Golden Ratio
© 2008 Pearson Addison-Wesley. All rights reserved The Fibonacci Sequence A famous problem: A man put a pair of rabbits in a cage. During the first month the rabbits produced no offspring, but each month thereafter produced one new pair of rabbits. If each new pair thus produced reproduces in the same manner, how many pairs of rabbits will there be at the end of one year?
© 2008 Pearson Addison-Wesley. All rights reserved The Fibonacci Sequence The solution of the problem leads to the Fibonacci sequence. Here are the first thirteen terms of the sequence 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233. Notice the pattern. After the first two terms (both 1), each term is obtained by adding the two previous terms.
© 2008 Pearson Addison-Wesley. All rights reserved Recursive Formula for Fibonacci Sequence If F n represents the Fibonacci number in the nth position in the sequence, then
© 2008 Pearson Addison-Wesley. All rights reserved Example: A Pattern of the Fibonacci Numbers Find the sum of the squares of the first n Fibonacci numbers for n = 1, 2, 3, 4, 5, and examine the pattern. Generalize this relationship. Solution 1 2 = = = = = 40 F 1 · F 2 F 2 · F 3 F 3 · F 4 F 4 · F 5 F 5 · F 6 Pattern: F n · F n+1
© 2008 Pearson Addison-Wesley. All rights reserved The Golden Ratio Consider the quotients of successive Fibonacci numbers and notice a pattern. These quotients seem to go toward In fact, they approach Which is known as the golden ratio.
© 2008 Pearson Addison-Wesley. All rights reserved Golden Rectangle A golden rectangle is one that can be divided into a square and another (smaller) rectangle the same shape as the original. W L L
© 2008 Pearson Addison-Wesley. All rights reserved Example of Golden Rectangle: Parthenon in Athens
© 2008 Pearson Addison-Wesley. All rights reserved Spiral Construct the divisions of a (nearly) golden rectangle below. Use a smooth curve to connect the vertices of the squares formed. This curve is a spiral.
© 2008 Pearson Addison-Wesley. All rights reserved Example of Spiral in Nature: Shell of Chambered Nautilus
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