While the logic of mathematical deduction proves through formula, and the science of induction shows value through the triad of observation-interpretation-application,22 abduction measures the truth of a theory in relationship to experiences of its results. For Peirce conception must have some conceivable “apps,” some observable effects of its applications. In abduction, the “gate of perception” meets the “gate of purposive action.” Experience yields purpose yields action. In a sense, abduction is the semiotic signpost of Luther’s doctrine of justification by faith: one is justified by faith
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