### Ideas from 'Explanatory Coherence' by Paul Thagard [1989], by Theme Structure

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###### 14. Science / D. Explanation / 2. Types of Explanation / c. Explanations by coherence
 17064 1: Coherence is a symmetrical relation between two propositions
 Full Idea: 1: Coherence and incoherence are symmetrical between pairs of propositions. From: report of Paul Thagard (Explanatory Coherence [1989], 1) by J.J.C. Smart - Explanation - Opening Address p.04
 17065 2: An explanation must wholly cohere internally, and with the new fact
 Full Idea: 2: If a set of propositions explains a further proposition, then each proposition in the set coheres with that proposition, and propositions in the set cohere pairwise with one another. From: report of Paul Thagard (Explanatory Coherence [1989], 2) by J.J.C. Smart - Explanation - Opening Address p.04
 17066 3: If an analogous pair explain another analogous pair, then they all cohere
 Full Idea: 3: If two analogous propositions separately explain different ones of a further pair of analogous propositions, then the first pair cohere with one another, and so do the second (explananda) pair. From: report of Paul Thagard (Explanatory Coherence [1989], 3) by J.J.C. Smart - Explanation - Opening Address p.04
 17067 4: For coherence, observation reports have a degree of intrinsic acceptability
 Full Idea: 4: Observation reports (for coherence) have a degree of acceptability on their own. From: report of Paul Thagard (Explanatory Coherence [1989], 4) by J.J.C. Smart - Explanation - Opening Address p.04 A reaction: Thagard makes this an axiom, but Smart rejects that and says there is no reason why observation reports should not also be accepted because of their coherence (with our views about our senses etc.). I agree with Smart.