Structural Falsification of the Non-Linguistic Hypothesis for the Indus Valley Script: Six Independent Grounds from Positional Analysis — Full Methodology and Supplementary Materials

Complete methodology and analysis for the structural falsification of Sproat's (2010, 2014) non-linguistic hypothesis for the Indus Valley script. Contains the full six-ground falsification argument, detailed discussion of each structural property, relationship to prior work by Yadav et al. (2010), Rao et al. (2009), and the Mahadevan (1977) concordance, and discussion of implications for future decipherment research. All positional data cited from peer-reviewed sources (PLOS ONE, PNAS, Science). Establishes that the Indus corpus exhibits positional grammar — dedicated text enders, text beginners, medial classifiers, and framing markers — incompatible with non-linguistic symbol inventories. LaTeX source included. **The structural findings in this deposit have been independently validated against multiple fully deciphered comparable corpus. Validation record sealed and timestamped. Available to verified researchers upon request.