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Unformatted text preview: . Logic Puzzles ༉ An island has two kinds of inhabitants, knights, who always tell the truth, and knaves, who always lie. ༉ You go to the island and meet A and B. ༉ A says “B is a knight.” ༉ B says “The two of us are of opposite types.” Example: What are the types of A and B? Solution: Let p and q be the statements that A is a knight and B is a knight, respectively. So, then ¬ p represents the proposition that A is a knave and ¬ q that B is a knave. ༉ If A is a knight, then p is true. Since knights tell the truth, q must also be true. This is a contradiction. ༉ If A is a knave, then B must not be a knight since knaves always lie. So, then both ¬ p and ¬ q hold since both are knaves. Logic Circuits ༉ Electronic circuits; each input/output signal can be viewed as a 0 or 1. ༉ 0 represents False and 1 represents True ༉ Complicated circuits are constructed from three basic circuits called gates. ༉ The inverter (NOT...
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This document was uploaded on 02/27/2014 for the course CS 215 at SIU Carbondale.
 Spring '14
 M.Nojoumian
 Computer Science

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