Consider a knowledge base containing just two sentences: $P(a)$ and $P(b)$. Does this knowledge base entail $\forall\,x\ P(x)$? Explain your answer in terms of models.
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Consider a knowledge base containing just two sentences: $P(a)$ and $P(b)$. Does this knowledge base entail $\forall\,x\ P(x)$? Explain your answer in terms of models.