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.
Gist of Idea
3: If an analogous pair explain another analogous pair, then they all cohere
Source
report of Paul Thagard (Explanatory Coherence [1989], 3) by J.J.C. Smart - Explanation - Opening Address p.04
Book Reference
'Explanation and Its Limits', ed/tr. Knowles,Dudley [CUP 1990], p.4