In contemporary discussions of the Ramsey Test for conditionals, it is commonly held that (i) supposing the antecedent of a conditional is adopting a potential state of full belief, and (ii) Modus Ponens is a valid rule of inference. I argue on the basis of Thomason Conditionals (such as ‘If Sally is deceiving, I do not believe it’) and Moore’s Paradox that both claims are wrong. I then develop a double-indexed Update Semantics for conditionals which takes these two results into account while doing justice to the key intuitions underlying the Ramsey Test. The semantics is extended to cover some further phenomena, including the recent observation that epistemic modal operators give rise to something very like, but also very unlike, Moore’s Paradox.
KeywordsRamsey Test Suppositional reasoning Modus Ponens Update Semantics
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- Beaver D.I. (2001) Presupposition and assertion in dynamic semantics. CSLI Publications, Stanford, CAGoogle Scholar
- Groenendijk J., Stokhof M., Veltman F. (1996) Coreference and modality. In: Lappin S. (eds) Handbook of contemporary semantic theory. Blackwell, Oxford, pp 179–214Google Scholar
- Hansson S.O. (1999) A textbook of belief dynamics: Theory change and database updating. Kluwer Academic Press, DordrechtGoogle Scholar
- Jackson F. (1987) Conditionals. Basil Blackwell, OxfordGoogle Scholar
- Levi I. (1980) The enterprise of knowledge. MIT Press, Cambridge, MAGoogle Scholar
- Lewis, D. K. (1986). Postscripts to probability of conditionals and conditional probability. In D. Lewis (Ed.), Philosophical papers (Vol. 2, pp. 152–156). New York: Oxford University Press.Google Scholar
- Ramsey, F. P. (1990). General propositions and causality. In D. H. Mellor (Ed.), Philosophical papers. Cambridge: Cambridge University Press, pp. 145–163.Google Scholar
- Rott H. (2001) Change, choice and inference. Oxford University Press, New YorkGoogle Scholar
- van Fraassen B. (1980) ‘Review of Brian Ellis, Rational belief systems’. Canadian Journal of Philosophy 10(3): 497–511Google Scholar
- Woods, M. (1997). Conditionals. Oxford: Clarendon Press. Edited by David Wiggins, with a commentary by Dorothy Edgington.Google Scholar