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Extensions
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It is possible to represent everything you want in propositional logic
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But often this is not very efficient
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Basic idea : A proposition is expressed as predicate about (on or more) objects in the world
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Propositions are predicates and arguments
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I.e. Car(Mercedes Benz).
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The most immediate way to develop a more complex logical calculus is to introduce rules that are sensitive to more fine-grained details of the sentences being used
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When the atomic sentences of propositional logic are broken up into terms, variables, predicates, and quantifiers, they yield first-order logic , which keeps all the rules of propositional logic and adds some new ones
