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Coherence theory of truth
Coherence theory of truth regards truth as coherence within some specified set of sentences, propositions or beliefs.〔http://plato.stanford.edu/entries/truth-coherence/〕 There is no single set of such "logical universes", but rather an assortment of perspectives that are commonly discussed under this title. The model is contrasted with the correspondence theory of truth.
A positive tenet is the idea that truth is a property of whole systems of propositions and can be ascribed to individual propositions only derivatively according to their coherence with the whole. While modern coherence theorists hold that there are many possible systems to which the determination of truth may be based upon coherence, others, particularly those with strong religious beliefs hold that the such truth only applies to a single absolute system. In general, then, truth requires a proper fit of elements within the whole system. Very often, though, coherence is taken to imply something more than simple formal coherence. For example, the coherence of the underlying set of concepts is considered to be critical factor in judging its coherence and validity. In other words, the set of base concepts in a universe of discourse must form an intelligible paradigm before many theorists consider that the coherence theory of truth is applicable.
==Varieties of coherence theories==
According to one view, the coherence theory of truth is the "theory of knowledge which maintains that truth is a property primarily applicable to any extensive body of consistent propositions, and derivatively applicable to any one proposition in such a system by virtue of its part in the system" (Benjamin 1962). Ideas like this are a part of the philosophical perspective known as ''theoretical holism'' (Quine & Ullian 1978). However, coherence theories of truth do not claim merely that coherence and consistency are important features of a theoretical system — they claim that these properties are ''sufficient'' to its truth. To state it in the reverse, that "truth" exists only within a system, and doesn't exist outside of a system.
According to another version of coherence theory, championed especially by H.H. Joachim, truth is a ''systematic coherence'' that involves more than logical consistency. In this view, a proposition is true to the extent that it is a necessary constituent of a systematically coherent whole. Others of this school of thought, for example, Brand Blanshard, hold that this whole must be so interdependent that every element in it necessitates, and even entails, every other element. Exponents of this view infer that the most complete truth is a property solely of a unique coherent system, called the ''absolute'', and that humanly knowable propositions and systems have a degree of truth that is proportionate to how fully they approximate this ideal.(Baylis 1962).
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