Letf(x) =(3x + 1 for odd x x/2 for even x for any natural

Introduction to the Theory of Computation | 3rd Edition | ISBN: 9781133187790 | Authors: Michael Sipser

Problem 5.31 Chapter 5

Introduction to the Theory of Computation | 3rd Edition

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Introduction to the Theory of Computation | 3rd Edition | ISBN: 9781133187790 | Authors: Michael Sipser

Introduction to the Theory of Computation | 3rd Edition

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Problem 5.31

Letf(x) =(3x + 1 for odd x x/2 for even x for any natural number x. If you start with an integer x and iterate f, you obtain a sequence, x,f(x),f(f(x)),... . Stop if you ever hit 1. For example, if x = 17, you get the sequence 17, 52, 26, 13, 40, 20, 10, 5, 16, 8, 4, 2, 1. Extensive computer tests have shown that every starting point between 1 and a large positive integer gives a sequence that ends in 1. But the question of whether all positive starting points end up at 1 is unsolved; it is called the 3x + 1 problem. Suppose that ATM were decidable by a TM H. Use H to describe a TM that is guaranteed to state the answer to the 3x + 1 problem.

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Class Notes DECEMBER 4 Weapons of Influence (cues for the peripheral route) 1. Reciprocity: giving a favor/gift obligates the person to give something back in return a. “door-in-the-face” - large demand first is rejected, then the seller does a ‘favor’ by lowering the price and makes a smaller demand b. “that’s-not-all” - the person offers a discount...

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Chapter 5, Problem 5.31 is Solved
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Textbook: Introduction to the Theory of Computation
Edition: 3
Author: Michael Sipser
ISBN: 9781133187790

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Letf(x) =(3x + 1 for odd x x/2 for even x for any natural

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