Question

(Symbolic Logic - Languge Proof and Logic)

Construct and Complete the proof using truth-function intro/elim inference rules, reit, and quantifier rules.

1-Dx (B(x) → R(x)) 2.3x(B(x)^ K(x)) ト 3x (K(x) ^ R(x))

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Answer #1

The proof will be

  1. i(B( Premise
  2. exists x (B(x)wedge K(x)) Premise
  3. x0 assume
  4. (B(x0)wedge K(x0))exists elim 2
  5. (B(x0) ightarrow R(x0)) forall elim 1
  6. B(x0) and elim 2
  7. K(x0) and elim 2
  8. R(x0) implication elim 5
  9. (R(x0)wedge K(x0)) and intro 7,8
  10. exists x (R(x)wedge K(x))exists intro 9

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