pith. sign in
theorem

phi_equation

proved
show as:

Why this theorem is linked from Measuring Massive Multitask Language Understanding unclear

Pith linked this Lean declaration because the review connected a specific passage in the paper to this theorem. The relation tag says how strong that connection is; it is not a generic placeholder.

We propose a new test to measure a text model's multitask accuracy. The test covers 57 tasks including elementary mathematics, US history, computer science, law, and more.

Relation between the paper passage and the cited Recognition theorem.

module
IndisputableMonolith.Foundation.PhiForcing
domain
Foundation
line
43 · github
papers citing
45 papers (below)

plain-language theorem explainer

The golden ratio φ obeys φ² = φ + 1. This identity is referenced by arguments that derive φ from self-similarity on a discrete J-cost ledger and by downstream results on forcing principles and economic inevitability. The proof reduces the claim to real arithmetic by unfolding the explicit definition of φ and closing via field simplification with nlinarith on square-root identities.

Claim. Let $φ = (1 + √5)/2$. Then $φ² = φ + 1$.

background

The PhiForcing module establishes that self-similarity in a discrete ledger equipped with J-cost forces the golden ratio. φ denotes the positive real solution to x² = x + 1, written explicitly as (1 + √5)/2. The upstream Algebra.PhiRing.phi_equation records the identical algebraic identity in a ring setting; the present version re-derives it for direct use in the foundation layer.

proof idea

The tactic sequence unfolds the definition of φ together with squaring, introduces the non-negativity of 5, verifies that the square of its square root recovers 5, applies field simplification, and closes with nlinarith using the square-root identity and non-negativity of squares.

why it matters

This identity supplies the algebraic core of the phi forcing principle, which states that self-similarity on a J-cost ledger forces the scale ratio to φ. It is invoked directly by golden_constraint_unique, phi_forcing_principle, phi_inv, phi_satisfies, economic_inevitability, and StillnessGenerative results. In the Recognition framework it realizes the T6 step fixing φ as the self-similar fixed point, consistent with the eight-tick octave and D = 3.

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