Transcription of Predicate Logic - Stanford University
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Predicate Logic - Stanford University
CHAPTER14FF FFPredicateLogicWe now turn our attention to a generalization of propositional Logic , called predi-cate, or first-order, Logic . predicates are functions ofzero or more variables thatreturn Boolean values. Thus predicates can be true sometimes and false sometimes,depending on the values of their arguments. For example, we shall find in predicatelogic atomic operands such ascsg(C, S, G). Here,csgis the Predicate name, andC,S, andGare arguments. We can think of this expression as a representationin Logic of the database relation Course-Student-Grade of Fig.
Logical Expressions We can build expressions from atomic formulas just as we built expressions in Section 12.3 from propositional variables. We shall continue to use the operators AND, OR, NOT, →, and ≡, as well as other logical connectives discussed in Chapter 12. In the next section, we introduce “quantifiers,” operators that can be ...
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