Abstract

The post-classical genre of the “protocols for dialectical inquiry and disputation” has its more proximate origins in the famed Risāla of Shams al-Dīn al-Samarqandī. The greater part of his conceptions and methodology, however, consists in a streamlining and universalizing of the more strictly juristic dialectic of his teacher Burhān al-Dīn al-Nasafī ; and this in turn draws on the highly logicized dialectic of Rukn al-Dīn al-ʿAmīdī and his teacher Raḍī al-Dīn al-Nīsābūrī. At the heart of methods in this lineage, and carried forward by al-Samarqandī into the universal ādāb al-baḥth, are three truth-preserving logical relationships critical to the truth-seeking enterprise of dialectic: entailment, mutual negation or exclusion, and causal concomitance. The practical elaboration of these relations reveals a logic in action—a premodern dialogical logic for living disputation praxis. In fact, so critical were these to the dialectical enterprise that al-Samarqandī devoted a specialized treatise entirely to summarizing their defining features and rules, aptly naming it the ʿAyn al-Naẓar, or “Wellspring of Rational Investigation.” In this article, and drawing upon a recently published digital critical edition, I will present an analytical outline of these core logical relations as presented in the ʿAyn al-Naẓar. Then I will address a number of points of interest in this text, grouped under six themes: the potential for cross-disciplinary advancement; notions in discursive development; significant or uniquely contributive formulations; peculiarities of content; signs of an evolving, universalist agenda; and evidence that the ʿAyn al-Naẓar was designed as an aide-mémoire for the active disputant.