Explanation Given information: Let A be a set with a partial order relation R and let S be a set of strings over A . Concept used: A relation ≺ _ on S is defined as follows: For any two strings in S , a 1 a 2 a 3 ... a m and b 1 b 2 b 3 .... b n where m and n are positive integers. If m ≤ n and a i = b i for all i = 1 , 2 , 3 , ..... , m then a 1 a 2 a 3 , .... a m ≺ _ b 1 b 2 .... b n . If for some integer k with k ≤ m , k ≤ n and k ≥ 1 , a i = b i for all i = 1 , 2 , 3 , .... , k − 1 and a k ≠ b k but a k R b k then a 1 a 2 , ...... , a m ≺ _ b 1 b 2 , .... , b n If ε is the null string and s is any string in S , then ε ≺ _ s . Proof: To prove ≺ _ is reflexive: Let s be any string in S . If s = ε , then s ≺ _ s by ( 3 ) . Suppose s ≠ ε . Let s = a 1 a 2 a 3 , ...... , a m . Then m ≤ m and a i = a i for all i = 1 , 2 , 3 , .... , m . Therefore, by ( 1 ) s = a 1 a 2 a 3 .... a m ≺ _ a 1 a 2 a 3 ......... a m = s s ≺ _ s Hence, ≺ _ is reflexive. To prove ≺ _ is antisymmetric: Let s = a 1 a 2 a 3 ...... a m ∈ S and t = b 1 b 2 b 3 ...... b m ∈ S such that s ≺ _ t and t ≺ _ s . Suppose i be the least positive integer such that a i ≠ b i . Since s ≺ _ t and t ≺ _ s therefore, a i R b i & b i R a i Since R is partial order relation on A , therefore a i R b i & b i R a i implies that a i = b i

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ISBN: 9780357540244

Author: EPP

Publisher: CENGAGE L

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Chapter 8.5, Problem 12ES

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≺_ is a partial order relation.

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