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Abstract: Computational Equivalence Lab Manual for Comparative.law (Version 4.0) Computational comparative law is the application of quantitative methods, Artificial Intelligence (AI), and Natural Language Processing (NLP) to analyze the evolution and similarity of legal systems. This lab manual establishes a structured, computable, and falsifiable methodology for measuring "legal distance" (d), as a standardized comparative metric, across both spatial (jurisdictional) and temporal (historical) dimensions. Standardized Comparative Metric (d): This framework establishes Legal Distance (d) as the invariant unit for quantifying jurisdictional convergence across space and time. The framework introduces the Classical-Computational Hybrid Methodology, expressed as A+B=C. This approach blends the qualitative, interpretative power of classical scholarship (A); with the quantitative scale and precision of modern computational metrics (B); to achieve an optimized, auditable outcome (C). Key Methodological Components: The Legal Distance Metric (d): A calibrated, 31-point numerical index (0.0 to 3.0) used to quantify the precise position of a legal concept on the Equivalence Spectrum. · The Vlegal Equation: A vector-based calculation used to measure the magnitude and direction of legal movement over time, defined as: The Algorithmic Filter: A three-step conditional decision tree that tests the relationship between Morphology (M), Teleology (P), and Practical Outcomes (R, Pr, N) to generate deterministic d-scores. The Unified Coordinate System: A mathematical framework mapping legal relativity across a 2D plane, conceptually analogous to a general theory of relativity for legal dynamics. Regulatory Compliance and Ethics: This methodology is specifically designed to satisfy mandatory ethical and legal requirements for Human-in-the-Loop (HITL) oversight and independent verification as defined by ABA Formal Op. 512 and Article 14 of the EU AI Act. All computational outputs are treated as preliminary diagnostics until they undergo a Scholarly Authentication protocol, where a qualified human expert assumes professional and intellectual liability for the final comparison. Technical Implementation: The manual details the Computational Equivalence Engine (v1.0), a Python-based implementation offering two modes: The Abacus (deterministic calculation) and The Brain (AI-powered exploratory research).