The theorem on ontological randomness of possible worlds: in defence of relativism towards possible worlds ontology
Keywords:modal logic, possible worlds semantics, logical semantics, epistemic logic, analytical philosophy, the philosophy of logic
The article deals with the ontology of the possible worlds in possible world semantics. Possible worlds are considered from instrumentalist point of view (according to which we have no need in regulating of the relation of possible world to actual world in possible truths and necessary truths as well). Basing on such an approach, the author suggests an assumption, according to which there is any randomness towards ontology and description fulfillment of possible worlds is permissible, until this randomness doesn't affect the truth/falsity of propositions in possible world. In case if such an ontological parameter, that we include to certain possible world after proposition truth/falsity setting for this world, somehow changes the true/false meaning of the proposition, this parameter is unacceptable, since possible world becomes instrumentally useless for the certain investigation, for which this world is been modeled. To substantiate the theorem that expresses the author's position, the article includes the two proofs of the theorem: the first proof is related to possible truths, the second - to necessary truths. The proof includes physically possible worlds and metaphysically possible worlds (that are called also "impossible possible worlds" by Hintikka). In addition to the proofs of theorem, the author also suggests the example of practical use of theorem in possible world modeling and proposition analysis.
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