<logic> also cohesiveness, a semantic relation among a number of elements, such as propositions or concepts, that fit together well.
Philosophers have offered coherence theories of truth, knowledge and ethics. For example, scientific theories can be justified on the basis of how well they cohere internally and externally, with evidence and other beliefs.
Connectionist algorithms have been used to provide computational models of coherence-based inferences, with applications to abduction, impression formation, and analogy.
Coherence is a semantic concept (the meaning or truth of p is compared to the meaning or truth of q), consistency is a syntactical concept (p is compared to not-p).
See practical reasoning, connectionism
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