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4. (20 points) Let P(x,y) be the predicate x=y3. If we use Z to denote all integers, what are the truth values of the

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4. (20 points) Let P(x,y) be the predicate " x=y3." If we use Z to denote all integers, what are the truth values of the following logical expressions? Justify your answers. a. xZyZP(x,y) b. yZxZP(x,y) c. P(1,1) d. P(2,2)

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