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hw2_BSol - CS 440 Introduction to AI Homework 2 Part B...

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CS 440: Introduction to AI Homework 2 - Part B Solution Due: September 28 11:59PM, 2010 Your answers must be concise and clear. Explain sufficiently that we can easily determine what you understand. We will give more points for a brief interesting discussion with no answer than for a bluffing answer. 1 Resolution Refutation Consider the following English sentences. They are already translated into FOPC sentences. (1) DaeHoon is a CS student. CS student( DaeHoon ) (2) Every CS student has been to the CRCE (Campus Recreation Center). x (CS student( x ) Visited( x, CRCE )) (3) There is a racquetball court in CRCE. x (Is racquetball court( x ) Located in( x, CRCE )) (4) No graduate student plays squash. x (Is grad student( x ) ⇒ ¬ Plays squash( x )) (5) DaeHoon is a graduate student. Is grad student( DaeHoon ) (6) Everyone who plays racquetball also plays squash. x (Plays racquetball( x ) Plays squash( x )) (7) If a person who has a racquetball racquet has been somewhere with a racquetball court then the person plays racquetball.
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