Under what circumstances does Quine think that one is ontologically committed to the existence of something?

This led Quine—at least sometimes—to endorse an extended criterion of ontological commitment: a theory is ontologically committed to an entity or kind of entity if and only if every acceptable paraphrase of the theory into (austere) first-order predicate logic is ontologically committed to that entity or kind of entity …

What is the ontological commitment of propositional logic?

An ontological commitment of a language is one or more objects postulated to exist by that language. The ‘existence’ referred to need not be ‘real’, but exist only in a universe of discourse.

What is the difference between ontology and logic?

That is, whereas ontology is an intuitive, informal inquiry into the categorial aspects of entities in general, “logic is the systematic formal, axiomatic elaboration of this material predigested by ontology” (ibid.)

What is the problem of ontology?

Many classical philosophical problems are problems in ontology: the question whether or not there is a god, or the problem of the existence of universals, etc.. These are all problems in ontology in the sense that they deal with whether or not a certain thing, or more broadly entity, exists.

Is the ontological argument valid?

This argument seems to be valid, since the truth of the premises would guarantee the truth of the conclusion. And it also seems to be sound, since, in addition, the premises seem to be true. But there is another less direct way to argue for a claim, which is sometimes called reductio ad absurdum, or just reductio.

Why is the ontological argument deductive?

The Ontological Argument fails because it omits one small but powerful word: ‘If’. With unicorns: If there are unicorns, then they will be horses with horns. With God: If there is a God, then God will exist necessarily. 1 It is a deductive argument, so if it succeeds, it is a proof of the existence of God.

What is an ontological truth?

The correspondence theory of truth is at its core an ontological thesis: a belief is true if there exists an appropriate entity – a fact – to which it corresponds. If there is no such entity, the belief is false.

What is the meaning of Quine’s slogan no entity without identity?

“No entity without identity” is a much-quoted slogan coined by Quine to sum up his position here. Take, for instance, the possible fat man in that doorway; and, again, the possible bald man in that doorway. Are they the same possible man, or two possible men? How do we decide?

What is ontological and epistemological assumptions?

Ontological assumptions (nature of reality): There is one defined reality, fixed, measurable, and observable. Epistemological assumptions (knowledge): Genuine knowledge is objective and quantifiable. The goal of science is to test and expand theory.

What is the link between ontology and epistemology?

In other words, epistemology deals with theories of knowledge. Ontology is concerned with the existential conditions related to material, social, cultural and political contexts. Hence, the question of relations between epistemology and ontology assumes importance.

What comes first ontology or epistemology?

The prefix of ‘epistemology’ comes from ‘episteme,’ for knowledge. So, ontology is not itself reality; it is theory of, or words about, reality. Epistemology is not itself knowledge or interpretations; it is theory of, or words about, knowledge and interpretations.