Mark Sainsbury

Rational dialetheism is the view that for some contradictions, it is rational to believe that they are true. The view, associated with the work of among others, Graham Priest, looks as if it must lead to absurd consequences, and the present paper is an unsuccessful attempt to find them. In particular, I suggest that there is no non-question-begging account of acceptance, denial and negation which can be brought to bear against the rational dialetheist. Finally, I consider the prospect of attacking the position without trying to "refute" it, but even these approaches seem unpromising in the present case. If the drift of the paper is correct, the only strategy is to examine the paradoxes one by one, and show in each case that the best account is non-dialetheic.

Logic ought to guide our thinking. It is better, more rational, more intelligent to think logically than to think illogically. Illogical thought leads to bad judgment and error. In any case, if logic had no role to play as a guide to thought, why should we bother with it?The somewhat naïve opinions of the previous paragraph are subject to attack from many sides. It may be objected that an activity does not count as thinking at all unless it is at least minimally logical, so logic is constitutive of thought rather than a guide to it. Or it may be objected that whereas logic describes a system of timeless relations between propositions, thinking is a dynamic process involving revisions, and so could not use a merely static guide. Or again the objection may be that there is no such thing as logic, only a whole variety of different logics, not all of which could possibly be good guides.

When are two tokens of a name tokens of the same name? According to this paper, the answer is a matter of the historical connections between the tokens. For each name, there is a unique originating event, and subsequent tokens are tokens of that name only if they derive in an appropriate way from that originating event. The conditions for a token being a token of a given name are distinct from the conditions for preservation of the reference of a name. Hence a name may change its reference. Defending the theory requires considerations about the identity of acts, and about empty names and disagreement. The upshot is a causal theory of the identity of names, but not what would normally be counted as a causal theory of the reference of names. Although reference is often transmitted causally, what determines semantic reference is conventionalized speaker-reference.