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________ predicate calculus allows quantified variables to refer to objects in the domain of discourse and not to predicates or functions.

1. Zero-order
2. First-order
3. Second-order
4. High-order

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Reference : First Order Predicate Calculus Example and Explanation is Here

by Boss (45.3k points)
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Ans is B

First-order logic is a collection of formal systems used in mathematicsphilosophylinguistics, and computer science. It is also known as first-order predicate calculus, thelower predicate calculusquantification theory, and predicate logic. First-order logic uses quantified variables over (non-logical) objects. It allows the use of sentences that contain variables, so that rather than propositions such as Socrates is a man one can have expressions in the form X is a man where X is a variable. This distinguishes it frompropositional logic, which does not use quantifiers.

A theory about a topic is usually a first-order logic together with a specified domain of discourse over which the quantified variables range, finitely many functions from that domain to itself, finitely many predicates defined on that domain, and a set of axioms believed to hold for those things. Sometimes "theory" is understood in a more formal sense, which is just a set of sentences in first-order logic.

by Boss (48.8k points)
+1 vote

First-order predicate calculus allows quantified variables to refer to objects in the domain of discourse, and not to predicates or functions.

by Active (1.9k points)

+1 vote