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# Logic0907 - Logic of Lying and Truthtelling 1 2 Puzzles...

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OE ° =± ±±± ±± Logic of Lying and Truth- telling 1. Puzzles 2. Nelson Goodman Principle (NGP)

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Check out the course web board: http://web.kaist.ac.kr/~philist (up and running) Typo on p.15 About 10 lines from the top Two claims couldn’t both be false => true
The syllabus indicates that my office is Room 1214. On the lecture slides, it is Room 1210. Both of these statements cannot be true. They are inconsistent . Q. Am I a knight or a knave?

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Ch.1 puzzles Island of Knights and Knaves Each inhabitant is either a knight or a knave. Knights always tell the truth. Knaves always lie.
Problem 1.1 Are you a knight of a knave? A: (indistinct murmur) What did A say? B: He said that he is a knave . C: Don’t believe that; it’s a lie. Q. What is C? A couldn’t say that.

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No inhabitant can say: “I am a knave.” If s/he is a knight, “ ” is a lie, but a knight never lies. If s/he is a knave, “” is true, but a knave never tells the truth.
About the remark below problem 1.3 If a knave says “p”, and then “q”, both p and q are false.

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Logic0907 - Logic of Lying and Truthtelling 1 2 Puzzles...

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