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Past, Present and Future$
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Arthur Prior

Print publication date: 1967

Print ISBN-13: 9780198243113

Published to Oxford Scholarship Online: October 2011

DOI: 10.1093/acprof:oso/9780198243113.001.0001

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Time and Existence

Time and Existence

(p.137) VIII Time and Existence
Past, Present and Future

Arthur Prior

Oxford University Press

This chapter covers the following topics: modalized and tensed predicate logic; ancient, medieval, and modern objections to coming to be, being brought into being, and being prevented from being; ampliation; objections to standard modal logic suggested by Myhill, Ramsey, and Chrysippus; Moore on what might not have existed, and on what once did not exist; arguments against some common principles of modal and tense-logic; the modal system Q, its modifications, and its adaptation to tense-logic; tensed predicate logic with now-empty names; tensed ontology; internal and external complexity in systems with free individual variables; the difficulties of doing without non-existents; the admission of past existents but not future ones; and the summary of possible positions.

Keywords:   modal logic, being, ampliation, Myhill, Ramsey, Chrysippus, tense-logic

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