No Crowning the Frontier: Finite Explanatory Delivery and the Limits of Internal Certification

Any finite explanatory performance must terminate somewhere. The Agrippan trilemma is usually taken to leave three live responses to explanatory pressure: infinite regress, circular support, and brute stopping. At the level of finite explanatory delivery, this picture changes. Neither infinite regress nor open circular support can be successfully handed over as complete in a finite performance. What finite delivery necessarily yields is a stopping structure. The central question is therefore not whether explanation stops, but whether a finite delivery can internally certify one of its own stopping points—or the inferential principles governing its own certifying transitions—as the finally authorized terminus of inquiry. I develop a structural model of explanatory obligations and establish three results. First, every successfully delivered finite explanation has a non-empty frontier. Second, frontier status and completed internal certification are structurally incompatible: once the certification of a frontier item is internally completed, justificatory load is represented upstream and the frontier shifts. Third, the same incompatibility extends to operative inferential principles: any internal certification of the principles governing admissible explanatory transitions either presupposes those very principles or proceeds under further governing principles that displace the inferential stopping point. The upshot is an anti-coronation result: no finite explanatory delivery can internally complete the final certification of its own stopping points or of its own operative inferential principles. The conclusion is not skeptical but methodological: a structural limit on what finite explanatory practices can complete from within their own delivered resources. Keywords: Agrippan trilemma; epistemic circularity; explanatory regress; finite explanatory delivery; inferential principles; methodology