Research-Stack/0-Core-Formalism/lean/external/OTOM/MasterEquation.lean

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/-
MasterEquation.lean - Anisotropically Frustrated Torsional Gradient Flow
This module formalizes the "Minimal Compact System" (Section 7) as the
authoritative governing evolution for the Sovereign Informatic Manifold.
Equations (Discrete Time):
1. Phase Flow: ϕ_{t+1} = ϕ_t + Δt [ ∇_i(M^ij ∇_j μ) - σ (∂I_lock/∂ϕ) ]
2. Local Potential: μ = δF/δϕ
3. Embedding Flow: X^A_{t+1} = X^A_t + Δt [ -Λ^AB(X^B - X_0^B) - δF/δX^A + τ T^A ]
One-line interpretation: The fabric folds back into n-space, snagging on
anisotropic frustration, storing stress as torsional geometry.
-/
import Semantics.DynamicCanal
import Semantics.BraidBracket
import Semantics.ManifoldFlow
namespace Semantics.MasterEquation
open DynamicCanal
open Semantics.BraidBracket
open Semantics.ManifoldFlow
-- =============================================================================
-- THE MINIMAL COMPACT SYSTEM (Section 7)
-- =============================================================================
/--
Executes one step of the "n-space foldback-lock" equation.
Encapsulates the hyperfluid phase evolution and embedding dynamics.
-/
def foldbackLockStep
(p : ManifoldPoint)
(dt : Fix16)
(prevX : PhaseVec)
: ManifoldPoint :=
let nextPhi := flowPhi p dt
let nextX := flowEmbedding p dt prevX
{ p with phi := nextPhi, x_pos := nextX }
/--
Master Equation: Recursive Manifold Evolution
Σ̂_{t+1} = FoldbackLockStep(Σ_t, Δt, Σ_{t-1})
-/
def masterEquation
(curr : ManifoldPoint)
(prev : ManifoldPoint)
(dt : Fix16)
: ManifoldPoint :=
foldbackLockStep curr dt prev.x_pos
-- =============================================================================
-- LEGACY MAPPING (Braid Compatibility)
-- =============================================================================
-- Keeping these as shims for the SLUG-3 decoder which operates on segments of
-- the manifold generated by these flows.
structure CMYK where
c : Fix16
m : Fix16
y : Fix16
k : Fix16
deriving Repr, DecidableEq, BEq
def CMYK.zero : CMYK := ⟨Fix16.zero, Fix16.zero, Fix16.zero, Fix16.zero⟩
end Semantics.MasterEquation