This document introduces the Moura Fundamental Principle of Intelligence (FPI) as a minimal structural postulate establishing a necessary, not sufficient, structural condition for the presence of intelligence in a system. The FPI constrains what must be structurally present whenever intelligence is observed: the coupled operation of constructive (C) and decompositional (D) processes, recursively applied across levels of abstraction, independent of domain, implementation, or substrate. The principle is formulated as a one-way implication and is explicitly falsifiable. To operationalize this principle, the CAMAF (Alex Moura Factual Analysis Criterion) axiomatic framework is introduced. CAMAF provides explicit epistemological classification (Fact, Inference, Opinion, Narrative), justificatory traceability, and detection of undeclared inferences and epistemic simulation (S). It further introduces domain separation (Ω), a logarithmic structural scale (FFPI), and an observability adjustment (Oₒbs). The axiomatic nucleus comprises fifteen axioms organized in seven layers, culminating in Axiom 15 (Structural Regime Accountability), which establishes that epistemological reliability is bounded by the structural regime of the system. Version 2. 0. 5 is a PATCH release: references file renamed to document version convention; Structuristics prose references updated to v2. x (general) and v2. 0. x (content-specific). No content changes. The public API of the document (the FPI postulate, the fifteen axioms, and the structural regime taxonomy) remains stable under Semantic Versioning 2. 0. 0. Derivation chain: CAMAF Operational Standard (DOI: 10. 5281/zenodo. 19990064) → FPI (this document) → Structuristics (DOI: 10. 5281/zenodo. 19636897) → downstream corpus (Moura Test, Babel, Consciousness Towers, etc. ). CAMAF compliance level: CS2. ORCID: 0009-0009-4427-0540.
Alexsandro Moura (Mon,) studied this question.