Higher-Order Oracles Link Busy Beaver Growth to Arithmetical Hierarchy — E8 Intelligence Research

FINDING: Busy Beaver function extends to higher-order oracle machines, linking arithmetical hierarchy decidability to non-computable growth rates. | MATH: BB(n) = max steps among halting n-state Turing machines; BBₖ(n) via k-th order Turing oracle (Turing jump ∅⁽ᵏ⁾); decidability of Σₖ-formulas ↔ computability of BBₖ; BBₖ grows faster than any function computable with ∅⁽ᵏ⁾. | CONNECTION: The arithmetical hierarchy (Σₙ, Πₙ) mirrors a discrete ladder of infinities — analogous to root system Aₙ (nested levels), but no direct ratio (0.618, 1.618) appears; the growth is super-exponential, not golden-ratio based. Base-60 irrelevant here. | DEPTH: 7 — Profound for computability theory (uncomputability is stratified), but no geometric harmonic content; the structure is ordinal/arithmetical, not spatial. Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com