15. Let the predicate knows(x, y) again denote that person x knows person y, and happy(x) to mean that person x is happy. Which one of the following first order logic formulas encodes the claim “Every happy person knows somebody who is not happy"? (a) V x : happy(x) =→ 3 y:(knows(x, y) → happy(y)) (b) ▼ x : 3 y: (happy(x) ^ knows(x, y)) =-happy(y) (c) 3 x: V y: happy(x, y) = knows(x,y) (d) ▼ x: 3 y:¬happy(x) V ( knows(x, y) ^ -happy(y))

15. Let the predicate knows(x, y) again denote that person x knows person y, and happy(x) to mean that person x is happy. Which one of the following first order logic formulas encodes the claim “Every happy person knows somebody who is not happy"? (a) V x : happy(x) =→ 3 y:(knows(x, y) → happy(y)) (b) ▼ x : 3 y: (happy(x) ^ knows(x, y)) =-happy(y) (c) 3 x: V y: happy(x, y) = knows(x,y) (d) ▼ x: 3 y:¬happy(x) V ( knows(x, y) ^ -happy(y))

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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