Structural Falsification of the Non-Linguistic Hypothesis for the Indus Valley Script: Six Independent Grounds from Positional Analysis — Priority Claim

Priority claim for the structural falsification of Sproat's (2010, 2014) non-linguistic hypothesis for the Indus Valley script on six independent grounds derived from positional analysis. Drawing on peer-reviewed positional data from Yadav et al. (2010, PLOS ONE), Rao et al. (2009, PNAS; 2009, Science), and the Mahadevan (1977) concordance, we demonstrate that the corpus exhibits: (1) Zone 2 entropy efficiency inconsistent with non-linguistic systems; (2) categorical text-ender behaviour in sign 342; (3) categorical text-beginner behaviour in sign 267; (4) extreme medial clustering exceeding 80% requiring embedded grammatical categories; (5) bimodal framing distribution; and (6) cross-site formula-unit repetition across Mohenjo-daro, Harappa, Lothal, and Kalibangan. Each ground independently contradicts the non-linguistic hypothesis. No ground requires phonetic readings or language-family assumptions. The falsification is structural: the Indus script encodes a system with positional grammar that non-linguistic symbol inventories cannot produce. Full methodology deposited under restricted access.