Question

First order logic (FOL) is called `first order’ because

A. FOL does not allow quantification over predicate symbols or function symbols.

B. Predicates are first-order relations.

C. FOL comes first in the logics involving quantifiers.

D. Propositional logic is zero-order

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Answer 1

Answer:  FOL is called `first order’ because:

         (c) FOL comes first in the logics involving quantifiers.

Explanation:

C. FOL is a system of deduction extending propositional logic by allowing quantification over individuals of a given domain, uses quantified variables over non-logical objects and allows the use of sentences that contain variables. However other Logic do not use quantifiers(i-e propositional logic), use functions as a argument (i-e higher order Logic).

Answer 2

Answer:

FOL is a collection of formal system. FOL is used in maths, philosophy, etc. FOL is called first order logic. It is also known as predicate logic.

It is written in the form of px or p(x) where p is the predicate and x is the subject . FOL is a type of reasoning where a sentence is broken into predicate and subject.

First order logic is called 'first order' beacuse it is also called first order predicate and predicates are first order relations. First order logic consists of a set of function symbols and a set of predicate.