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

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/- Copyright (c) 2026 Sovereign Research Stack. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Authors: Research Stack Team
RotationQUBO.lean — Rotation Matrices as Literal Rotation Notation in Frustrated QUBO Fields
This module formalizes a 1D scalar triangle navigating a frustrated QUBO field,
spawning friends to rotate in superposition. Each bracket represents a possibility space,
borrowing the PIST framework for shell geometry.
Key insight:
- Rotation matrices as literal rotation notation (not just linear algebra)
- 1D scalar triangle = (a, b, c) with a+b+c = 0 (triangle closure)
- Frustrated QUBO field = energy landscape with competing minima
- Spawning friends = agent generation in superposition
- Brackets = possibility spaces [lower, upper] from PIST shell geometry
- PIST mass = a*b (hyperbola index) as rotation weight
The rotation field:
Φ_rot(x, θ) = Σᵢ R(θᵢ) · xᵢ / (1 + frustration²)
Where:
- R(θ): rotation matrix at angle θ
- xᵢ: scalar triangle vertex
- frustration: QUBO field frustration parameter
Per AGENTS.md §0: Lean is the source of truth.
Per AGENTS.md §1.4: Q16_16 fixed-point for hardware extraction.
Per AGENTS.md §2: PascalCase types, camelCase functions.
Per AGENTS.md §4: Every def has eval witness or theorem.
-/
import Mathlib.Data.Nat.Basic
import Mathlib.Data.Real.Basic
import Mathlib.Data.Matrix.Basic
import Mathlib.Tactic
import Semantics.PIST
import Semantics.DynamicCanal
namespace Semantics.RotationQUBO
open PIST DynamicCanal
-- ═══════════════════════════════════════════════════════════════════════════
-- §0 Scalar Triangle Types
-- ═══════════════════════════════════════════════════════════════════════════
/-- A 1D scalar triangle (a, b, c) with closure condition a + b + c = 0.
Represents a balanced configuration that can navigate QUBO fields. -/
structure ScalarTriangle where
a : Fix16 -- First vertex
b : Fix16 -- Second vertex
c : Fix16 -- Third vertex
closure : Fix16 -- Closure residual (should be 0 for balanced triangle)
deriving Repr, DecidableEq, BEq
namespace ScalarTriangle
/-- Create a balanced scalar triangle from two vertices (c = -(a + b)). -/
def balanced (a b : Fix16) : ScalarTriangle :=
let c := Fix16.sub (Fix16.sub Fix16.zero a) b -- c = -(a + b)
let closure := Fix16.add (Fix16.add a b) c -- should be 0
{ a, b, c, closure }
/-- Create a scalar triangle from PIST coordinate (a = t, b = 2k+1-t). -/
def fromPISTCoord (coord : PIST.Coord) : ScalarTriangle :=
let a := fix16FromNat coord.t
let b := fix16FromNat coord.b
let c := Fix16.sub (Fix16.sub Fix16.zero a) b
let closure := Fix16.add (Fix16.add a b) c
{ a, b, c, closure }
/-- The PIST mass of the scalar triangle (a * b). -/
def pistMass (st : ScalarTriangle) : Fix16 :=
Fix16.mul st.a st.b
end ScalarTriangle
-- ═══════════════════════════════════════════════════════════════════════════
-- §1 Rotation Matrix as Literal Rotation Notation
-- ═══════════════════════════════════════════════════════════════════════════
/-- Rotation matrix at angle θ (2D rotation).
Treated as literal rotation notation, not just linear algebra. -/
structure RotationMatrix where
theta : Fix16 -- Rotation angle in radians (Q16.16)
cosθ : Fix16 -- cos(θ) in Q16.16
sinθ : Fix16 -- sin(θ) in Q16.16
deriving Repr, DecidableEq, BEq
namespace RotationMatrix
/-- Create rotation matrix from angle θ.
Uses Q16.16 approximation for cos and sin. -/
def fromAngle (theta : Fix16) : RotationMatrix :=
-- Placeholder: use Taylor series or lookup table for cos/sin
-- For now, use simple approximation
let cosθ := Fix16.ofNat 1 -- cos(0) = 1
let sinθ := theta -- sin(θ) ≈ θ for small θ
{ theta, cosθ, sinθ }
/-- Apply rotation matrix to scalar triangle vertex. -/
def rotateVertex (rm : RotationMatrix) (v : Fix16) : Fix16 :=
-- 2D rotation: x' = x·cosθ - y·sinθ
-- For 1D scalar, this is simplified
Fix16.mul v rm.cosθ
/-- Apply rotation matrix to entire scalar triangle. -/
def rotateTriangle (rm : RotationMatrix) (st : ScalarTriangle) : ScalarTriangle :=
let a' := rm.rotateVertex st.a
let b' := rm.rotateVertex st.b
let c' := rm.rotateVertex st.c
let closure' := Fix16.add (Fix16.add a' b') c'
{ a := a', b := b', c := c', closure := closure' }
end RotationMatrix
-- ═══════════════════════════════════════════════════════════════════════════
-- §2 Frustrated QUBO Field
-- ═══════════════════════════════════════════════════════════════════════════
/-- Frustrated QUBO field parameters.
Frustration parameter δ controls competing energy minima. -/
structure QUBOField where
frustration : Fix16 -- Frustration parameter δ (0 ≤ δ ≤ 1)
energyScale : Fix16 -- Energy scale factor
deriving Repr, DecidableEq, BEq
namespace QUBOField
/-- Compute field energy at position x.
E(x) = x² / (1 + δ²) - frustration penalty. -/
def fieldEnergy (qf : QUBOField) (x : Fix16) : Fix16 :=
let xSq := Fix16.mul x x
let denom := Fix16.add Fix16.one (Fix16.mul qf.frustration qf.frustration)
let energy := Fix16.div xSq denom
Fix16.sub energy qf.energyScale
/-- Check if field is frustrated at position x. -/
def isFrustrated (qf : QUBOField) (x : Fix16) : Bool :=
-- Field is frustrated if energy > 0
let energy := qf.fieldEnergy x
energy.raw > 0
end QUBOField
-- ═══════════════════════════════════════════════════════════════════════════
-- §3 Bracket Possibility Spaces
-- ═══════════════════════════════════════════════════════════════════════════
/-- Bracket possibility space from PIST shell geometry.
[lower, upper] = [a, b] where a + b = 2k+1 and mass = a*b. -/
structure BracketSpace where
lower : Fix16 -- Lower bound (a)
upper : Fix16 -- Upper bound (b)
mass : Fix16 -- PIST mass (a * b)
gap : Fix16 -- Upper - lower
admissible : Bool -- Whether space is admissible
deriving Repr, DecidableEq, BEq
namespace BracketSpace
/-- Create bracket space from PIST coordinate. -/
def fromPISTCoord (coord : PIST.Coord) : BracketSpace :=
let lower := fix16FromNat coord.a
let upper := fix16FromNat coord.b
let mass := fix16FromNat coord.mass
let gap := Fix16.sub upper lower
let admissible := coord.mass > 0 -- Positive mass = admissible
{ lower, upper, mass, gap, admissible }
/-- Check if a value is within the bracket space. -/
def contains (bs : BracketSpace) (x : Fix16) : Bool :=
let xNat := x.raw.toNat
let lowerNat := bs.lower.raw.toNat
let upperNat := bs.upper.raw.toNat
lowerNat ≤ xNat ∧ xNat ≤ upperNat
end BracketSpace
-- ═══════════════════════════════════════════════════════════════════════════
-- §4 Friend Spawning in Superposition
-- ═══════════════════════════════════════════════════════════════════════════
/-- A friend agent spawned in superposition.
Each friend has a rotation angle and weight. -/
structure FriendAgent where
rotation : RotationMatrix -- Rotation matrix
weight : Fix16 -- Superposition weight (0 ≤ weight ≤ 1)
bracket : BracketSpace -- Assigned bracket space
deriving Repr, DecidableEq, BEq
namespace FriendAgent
/-- Spawn a friend agent with random rotation. -/
def spawn (theta : Fix16) (bracket : BracketSpace) : FriendAgent :=
let rm := RotationMatrix.fromAngle theta
let weight := Fix16.ofNat 1 -- Default weight = 1.0
{ rotation := rm, weight, bracket }
/-- Spawn multiple friends in superposition. -/
def spawnSuperposition (thetas : List Fix16) (bracket : BracketSpace) : List FriendAgent :=
thetas.map (fun θ => spawn θ bracket)
end FriendAgent
-- ═══════════════════════════════════════════════════════════════════════════
-- §5 Rotation Field Computation
-- ═══════════════════════════════════════════════════════════════════════════
/-- Compute rotation field for scalar triangle in QUBO field with friends.
Φ_rot(x, θ) = Σᵢ R(θᵢ) · xᵢ / (1 + frustration²) -/
def rotationField (st : ScalarTriangle) (friends : List FriendAgent)
(qf : QUBOField) : Fix16 :=
let denom := Fix16.add Fix16.one (Fix16.mul qf.frustration qf.frustration)
-- Sum over friends: Σᵢ weightᵢ * rotationᵢ(triangle)
let sumRotations := friends.foldl (fun acc friend =>
let rotated := friend.rotation.rotateTriangle st
let weightedMass := Fix16.mul (ScalarTriangle.pistMass rotated) friend.weight
Fix16.add acc weightedMass
) Fix16.zero
-- Divide by frustration denominator
Fix16.div sumRotations denom
-- ═══════════════════════════════════════════════════════════════════════════
-- §6 Theorems: Rotation and Bracket Properties
-- ═══════════════════════════════════════════════════════════════════════════
/-- Theorem: Balanced scalar triangle has zero closure. -/
theorem balancedClosureZero (a b : Fix16) :
(ScalarTriangle.balanced a b).closure = Fix16.zero := by
unfold ScalarTriangle.balanced
-- c = -(a + b), so a + b + c = 0
sorry -- TODO(lean-port): Prove closure = 0 for balanced triangle
/-- Theorem: PIST mass from coordinate equals a * b. -/
theorem pistMassFromCoord (coord : PIST.Coord) :
(ScalarTriangle.fromPISTCoord coord).pistMass = fix16FromNat coord.mass := by
unfold ScalarTriangle.fromPISTCoord, ScalarTriangle.pistMass
-- mass = a * b = t * (2k+1-t)
sorry -- TODO(lean-port): Prove mass = a*b
/-- Theorem: Bracket space contains its bounds. -/
theorem bracketContainsBounds (bs : BracketSpace) :
bs.contains bs.lower ∧ bs.contains bs.upper := by
unfold BracketSpace.contains
-- lower ≤ lower and upper ≤ upper
sorry -- TODO(lean-port): Prove bracket contains its own bounds
/-- Theorem: Rotation field is bounded by bracket mass. -/
theorem rotationFieldBounded (st : ScalarTriangle) (friends : List FriendAgent)
(qf : QUBOField) (bs : BracketSpace) :
let field := rotationField st friends qf
field.raw ≤ bs.mass.raw := by
-- Rotation field divided by (1 + δ²) ≤ original mass
sorry -- TODO(lean-port): Prove field bounded by bracket mass
-- ═══════════════════════════════════════════════════════════════════════════
-- §7 Verification Examples
-- ═══════════════════════════════════════════════════════════════════════════
#eval let st := ScalarTriangle.balanced (Fix16.ofNat 3) (Fix16.ofNat 4)
st.pistMass -- Expected: 3 * 4 = 12
#eval let coord := { k := 2, t := 3, ht := by simp }
let bs := BracketSpace.fromPISTCoord coord
bs.admissible -- Expected: true (mass = 3 * (5-3) = 6 > 0)
#eval let qf := { frustration := Fix16.ofNat 1, energyScale := Fix16.ofNat 10 }
let x := Fix16.ofNat 5
qf.isFrustrated x -- Expected: true
-- TODO(lean-port): Add friend spawning and rotation field examples
end Semantics.RotationQUBO