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Propositional logic is not expressive enough (cont’)
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We'd like to be able to conclude that Pat will get wet, but nothing we have stated so far will help us do this
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The problem is that we aren't able to represent any of the details of these propositions
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It's the internal structure of these propositions that make the reasoning valid.
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But in propositional calculus we don't have anything else to talk about besides propositions!
⇒ A more expressive logic is needed
⇒ Predicate logic (occasionally referred to as First-order logic (FOL) )
