The Coherence Theory of Truth
First published Tue Sep 3, 1996; substantive revision Tue Sep 9, 2008 A coherence theory of truth states that the truth of any (true) proposition consists in its coherence with some specified set of propositions. The coherence theory differs from its principal competitor, the correspondence theory of truth, in two essential respects. The competing theories give conflicting accounts of the relation between propositions and their truth conditions. (In this article, ‘proposition’ is not used in any technical sense. It simply refers to the bearers of truth values, whatever they may be.) According to one, the relation is coherence, according to the other, it is correspondence. The two theories also give conflicting accounts of truth conditions. According to the coherence theory, the truth conditions of propositions consist in other propositions. The correspondence theory, in contrast, states that the truth conditions of propositions are not (in general) propositions, but rather objective features of the world. (Even the correspondence theorist holds that propositions about propositions have propositions as their truth conditions.) [pic]
1. Versions of the Coherence Theory of Truth
The coherence theory of truth has several versions. These versions differ on two major issues. Different versions of the theory give different accounts of the coherence relation. Different varieties of the theory also give various accounts of the set (or sets) of propositions with which true propositions cohere. (I will refer to such a set as a specified set.) According to some early versions of the coherence theory, the coherence relation is simply consistency. On this view, to say that a proposition coheres with a specified set of propositions is to say that the proposition is consistent with the set. This account of coherence is unsatisfactory for the following reason. Consider two propositions which do not belong to a specified set. These propositions could both be consistent with a specified set and yet be inconsistent with each other. If coherence is consistency, the coherence theorist would have to claim that both propositions are true, but this is impossible. A more plausible version of the coherence theory states that the coherence relation is some form of entailment. Entailment can be understood here as strict logical entailment, or entailment in some looser sense. According to this version, a proposition coheres with a set of propositions if and only if it is entailed by members of the set. Another more plausible version of the theory, held for example in (Bradley 1914), is that coherence is mutual explanatory support between propositions. The second point on which coherence theorists (coherentists, for short) differ is the constitution of the specified set of propositions. Coherentists generally agree that the specified set consists of propositions believed or held to be true. They differ on the questions of who believes the propositions and when. At one extreme, coherence theorists can hold that the specified set of propositions is the largest consistent set of propositions currently believed by actual people. For such a version of the theory, see Young (1995). According to a moderate position, the specified set consists of those propositions which will be believed when people like us (with finite cognitive capacities) have reached some limit of inquiry. For such a coherence theory, see Putnam (1981). At the other extreme, coherence theorists can maintain that the specified set contains the propositions which would be believed by an omniscient being. Some idealists seem to accept this account of the specified set. If the specified set is a set actually believed, or even a set which would be believed by people like us at some limit of inquiry, coherentism involves the rejection of realism about truth. Realism about truth involves acceptance of the principle of bivalence (according to which every...
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