Determining whether a quantified statement about the integers is true. Predicates P and Q are defined below. The domain is the set of all positive integers. P(x): x is prime Q(x): x is a perfect square (i.e., x = y2, for some integer y) Indicate whether each logical expression is a proposition. If the expression is a proposition, then give its truth value.     (d) ∃x (Q(x) ∧ P(x)) (e) ∀x (¬Q(x) ∨ P(x))

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Exercise 1.7.1: Determining whether a quantified statement about the integers is true.

Predicates P and Q are defined below. The domain is the set of all positive integers.

  • P(x): x is prime
  • Q(x): x is a perfect square (i.e., x = y2, for some integer y)

Indicate whether each logical expression is a proposition. If the expression is a proposition, then give its truth value.

 

 

(d)

∃x (Q(x) ∧ P(x))

(e)

∀x (¬Q(x) ∨ P(x))

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