Which of the following is a closed sentence? (x)((Tx → (Cx v Fx)) ∨ (Pp v...

Question

Question

Which of the following is a closed sentence?

(x)((Tx → (Cx v Fx)) ∨ (Pp v Max))

((∃x)(Px & Myx) → (y)(Cy v Dy))

((~Rstu → Lbcd) ∨ (w)~Lwcd)

Answer 1

Answer #1

Closed Sentence is a Mathematical Expression that is sure and certainly gives a true/false value after evaluation.

1- Axioms Rule is Applied in order to calculate the expression.

Like: A closed Sentence ~S is true if and only if S is not tue. and

a closed sentence X v Y is true if either X or Y is true. and so on.

So as per the Rule, it seems that the First Expression is Closed Sentence. because after the expansion and evaluation it gives the True.

Answer 2

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