MORPHIX: Feature Geometry, Vocabulary Insertion, and the Particle Stratification of PIE Pronominal and Adverbial Morphology

The Morphix manuscript argue that PIE 'pronominal roots' form a distinct morphologicalspecies: closed-class, non-derivable, non-compounding, non-ablauting atoms originating in prePIE deictic particles. The model represents these atoms as feature-bundle realizations organizedby a geometry whose primary nodes DEIXIS, ANAPH, and Q partition the functional space;optional INDEF and ALTERITY extend the system to indefinite and 'other' series. Vocabularyinsertion under the Subset Principle selects the most specific exponent compatible with thesyntactic feature bundle, generating syncretisms and blocking effects. Empirically, themanuscript compiles daughter-language reflex lists across major branches and derive adverbialparadigms by composing Morphix exponents with a small suffix system (-r/-d/-m/-o), as well asspecific diachronic pathways that connect PIE distal to- to the English th- series. This articleintegrates the manuscript into a single journal-style treatment, adds explicit comparative tables,diagrams, and falsifiable diagnostics, and frames a research program: cross-corpus assays ofparticle+suffix compositionality, typological channel hierarchies, and computationalreconstruction pipelines grounded in the Morphix geometry. Novelty upgrades in this revisioninclude (i) an executed pilot Morphix+suffix assay on Old English and Vedic/Sanskrit sampleswith quantitative coverage and cell-recovery metrics (§7.1), (ii) a minimal cost-based modelcomparison against a root-list baseline (§6.9), and (iii) explicit typological, learnability, andcomputational evaluation protocols that make the geometry falsifiable (§8–§9).