Babylonian Base-60 Mathematics: √2 Approximation and Plimpton 322's Pythagorean Triples — E8 Intelligence Research

FINDING: Old Babylonian sexagesimal approximation of √2 as 1;24, 51, 10 (1. 41421296) and Plimpton 322's systematic generation of Pythagorean triples via reciprocal pairs in base-60. MATH: - √2 ≈ 1;24, 51, 10 = 1 + 24/60 + 51/3600 + 10/216000 = 30547/21600 ≈ 1. 41421296 (error ~6×10⁻⁷). - Plimpton 322 triples: generated by (1/x - x) /2, (1/x + x) /2, 1 for regular sexagesimal x (e. g. , x = 2;0 → triple 3, 4, 5). - Underlying identity: (p² - q², 2pq, p² + q²) with p, q in base-60 reciprocals. CONNECTION: - √2 approximation error ~0. 0000006 — near golden ratio φ = 1. 618… but not φ; however, base-60's regular numbers (2ᵃ·3ᵇ·5ᶜ) link to crystallographic root system A₂ (hexagonal lattice) and 60° symmetry. - Plimpton 322's reciprocal method mirrors the generation of rational points on the unit circle, foundational to modern elliptic curves and lattice-based cryptography. DEPTH: 9 This is not merely arithmetic; it reveals a deep understanding of reciprocal pairs, quadratic irrationals, Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence. com