5. Assume that 3rvyP(r, y) is true and that the universe for r, y is nonempty. Which of the following must be true? Vray P(r, y) and yP(r,y). Prove your answer either using a regular proof in the natural language or by giving a formal inference. In the latter case you may need to use the existential rules of inference

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5. Assume that JrvyP(x, y) is true and that the universe for r, y is nonempty. Which of
the following must be true?
Vay P(r, y) and AyP(r, y).
Prove your answer either using a regular proof in the natural language or by giving
a formal inference. In the latter case you may need to use the existential rules of
inference.
Transcribed Image Text:5. Assume that JrvyP(x, y) is true and that the universe for r, y is nonempty. Which of the following must be true? Vay P(r, y) and AyP(r, y). Prove your answer either using a regular proof in the natural language or by giving a formal inference. In the latter case you may need to use the existential rules of inference.
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