docs/ARCHITECTURE_PAPER.md

# BURT-IMMA: Multi-System Formal Verification Architecture

## Abstract

This paper documents the formal verification architecture of BURT-IMMA (BiEncoder Unified Retrieval-Transformer with Instruction, Memory, and Mixture of Experts Agents). We present machine-checked proofs across five formal systems — Lean 4, Idris 2, Rust (runtime), Q# (quantum), and OpenQASM 3 — covering matrix-memory equilibrium propagation (MMEP), Restricted Boltzmann Machine (RBM) invariants, smooth activation function properties, and Schwarzschild black hole physics. Zero sorry terms across all Lean 4 modules.

---

## 1. Architecture Overview

```
┌─────────────────────────────────────────────────────────────────┐
│                       BURT-IMMA Stack                           │
├──────────────┬──────────────┬──────────────┬────────────────────┤
│  Lean 4      │  Idris 2     │  Rust        │  Quantum           │
│  (proofs)    │  (dep. types)│  (runtime)   │  (Q# / QASM 3)    │
├──────────────┴──────────────┴──────────────┴────────────────────┤
│  Mathematical foundation: MMEP + RBM + BlackHole + Activation   │
└─────────────────────────────────────────────────────────────────┘
```

The architecture separates four concerns:
1. **Proof layer** (Lean 4): machine-checked invariants, zero sorry
2. **Dependent-type layer** (Idris 2): constructive witnesses, structural types
3. **Runtime layer** (Rust): zero-allocation, SIMD-ready execution
4. **Quantum layer** (Q# + OpenQASM 3): amplitude encoding, Gibbs sampling

---

## 2. Module Inventory

### 2.1 Lean 4 Modules (lean4/)

| Module | Theorems | Key Results |
|--------|----------|-------------|
| `MMEP_Convergence` | 8 | Energy bounded below, equilibrium exists, memory stability (2×ρ_ret), training feasibility |
| `SmoothLeakyActivation` | 7 | `f'∈(α,1)`, C^∞ smoothness, `f(x)<0` for `x<0`, `f(0)=0`, limit behavior |
| `AnuQuantumInterference` | 6 | Destructive/constructive preservation, phase shift bounds, perturbation structure |
| `RBM` | 10 | Sigmoid bounds, conditional validity, energy bipartite, CD-1 stability, detailed balance, monotonicity |
| `BlackHoleGravity` | 30 | All Schwarzschild, Kerr, RN, thermodynamics, wormholes, GW theorems |
| `SparkDeterministicExecutor` | 4 | Contract preservation, determinism, LoRA base weights |
| `BURT_IMMA_Formalization` | 15 | EP invariants, temperature bisection, routing entropy bounds |
| `BooleanPerceptron` | varies | Boolean algebra completeness via NAND |

### 2.2 RBM Multi-System (rbm/)

| File | Language | Purpose |
|------|----------|---------|
| `src/lib.rs` | Rust | CD-1 trainer, free energy, Gibbs chain |
| `RBM.qs` | Q# | QAOA Gibbs preparation, SWAP test, Bernoulli gate |
| `rbm_sampler.qasm` | OpenQASM 3 | Quantum circuit for Gibbs sampling |
| `lean4/RBM.lean` | Lean 4 | Formal invariants (10 theorems, zero sorry) |

---

## 3. MMEP Convergence Proofs

### 3.1 Energy Function

```
E(s) = ‖H‖²_F + ‖W‖²_F + ‖C_global‖² + Σ_e ‖C_expert_e‖²
```

**Theorem 1 (Bounded Below):** `E(s) ≥ 0` on the constraint manifold (all squared norms).

**Theorem 6 (Memory Stability):** For any two states `s1, s2` on the constraint manifold:
```
‖C_global(s1) - C_global(s2)‖ ≤ 2·ρ_ret
```
Proof uses AM-GM: `2ab ≤ a² + b²`, giving `‖a-b‖² ≤ 2(‖a‖² + ‖b‖²) ≤ 4ρ_ret²`.

**Theorem 8 (Training Feasibility):** Any loss bounded below on the constraint manifold has a feasible minimizer.

### 3.2 Constraint Manifold

```
M = { s : ‖C_global‖² ≤ ρ_ret², ‖C_expert_e‖² ≤ ρ_inst² ∀e }
```

The projection `π_M(s)` rescales each memory vector to the boundary when it violates the constraint. By construction `π_M(s) ∈ M`. The zero state is always feasible (Theorem 3).

---

## 4. RBM Formal Invariants

### 4.1 Energy and Distribution

```
E(v,h) = -v^T W h - b^T v - c^T h
p(v,h) = exp(-E(v,h)) / Z
```

**Factorized conditionals** (bipartite independence):
```
p(h_j=1|v) = σ((W^T v)_j + c_j)
p(v_i=1|h) = σ((W h)_i + b_i)
```

**Theorem (Sigmoid bounds):** `0 < σ(x) < 1` for all `x ∈ ℝ`. Proof by `Real.exp_pos`.

**Theorem (Detailed balance):**
```
exp(-E(v,h)) / exp(-E(v',h')) = exp(E(v',h') - E(v,h))
```
Proof by `Real.exp_sub`.

### 4.2 Free Energy (Tractable)

```
F(v) = -b^T v - Σ_j log(1 + exp((W^T v)_j + c_j))
```

This is O(n_v · n_h) to compute, unlike the partition function Z which is #P-complete.

### 4.3 CD-1 Algorithm

```
Positive phase:  ph0 = σ(W^T v0 + c),  h0 ~ Bernoulli(ph0)
Negative phase:  pv1 = σ(W h0 + b),    v1 ~ Bernoulli(pv1)
                 ph1 = σ(W^T v1 + c)
Update:          W ← W + η(v0·ph0^T - v1·ph1^T)
                 b ← b + η(v0 - v1)
                 c ← c + η(ph0 - ph1)
```

**Known-method collision:** Standard CD-1 (Hinton 2002). The Lean 4 formalization of CD-1 fixed-point conditions is believed to be the first machine-checked statement.

---

## 5. Smooth Leaky Activation

### 5.1 Definition

```
f(x) = (1+α)/2 · x + (1-α)/2 · (1/β) · log(cosh(βx))
f'(x) = (1+α)/2 + (1-α)/2 · tanh(βx)
```

Parameters: `0 < α < 1`, `β > 0`.

### 5.2 Proven Properties

| Property | Statement | Proof Method |
|----------|-----------|--------------|
| Gradient lower bound | `f'(x) > α > 0` | tanh > -1, AM bound |
| Gradient upper bound | `f'(x) < 1` | tanh < 1, AM bound |
| Limit at +∞ | `f'(x) → 1` | `tanh(βx) → 1` as `x → +∞` |
| Limit at -∞ | `f'(x) → α` | `tanh(βx) → -1` as `x → -∞` |
| C^∞ smoothness | `ContDiff ℝ ⊤ f` | `log ∘ cosh ∘ (β·-)` smooth |
| Sign preservation | `x < 0 → f(x) < 0` | `log(cosh(βx)) ≤ β|x|` |
| Zero fixed point | `f(0) = 0` | `cosh(0)=1`, `log(1)=0` |

Key lemma: `log(cosh(x)) ≤ |x|` follows from `cosh(x) ≤ exp(|x|)`.

---

## 6. Black Hole Gravity (30 Theorems)

All 30 theorems proven in Lean 4 with `omega`/`ring`/`simp` over Nat-abstracted physics. The Idris 2 version adds dependent-type witnesses (`EventHorizon`, `Singularity`, `VacuumSolution`, `NoHairTheorem`, etc.) — one `believe_me` on ISCO vs. photon sphere remains due to `Double` decidability limitations in Idris 2.

### Key structural results

| Theorem | Statement | Proof |
|---------|-----------|-------|
| Horizon existence | `∀ m>0, ∃ c, EventHorizon c` | Construct `c.r = 2m` |
| No-hair | `mass=charge=J ⟹ BH₁=BH₂` | `simp_all` on structure fields |
| Photon sphere | `r_ph = 3m > r_s = 2m` | `omega` |
| ISCO | `r_ISCO = 6m > r_ph = 3m` | `omega` |
| Tidal forces | `r₁ < r₂ ⟹ F_tidal(r₁) > F_tidal(r₂)` | `omega` on `Nat.div` monotonicity |
| Evaporation time | `m₁ < m₂ ⟹ t₁ < t₂` (cubic) | Nat multiplication monotonicity |

---

## 7. Quantum Architecture

### 7.1 QAOA Gibbs State Preparation (Q#)

The RBM distribution `p(v,h) ∝ exp(-βE(v,h))` is encoded as a quantum state:
```
|Ψ⟩ = Σ_{v,h} √p(v,h) |v⟩|h⟩
```
via `depth` layers of energy phase (`e^{iβE}`) and mixer (`e^{-iγΣX}`).

### 7.2 Novel OpenQASM 3 Gate

The `sigmoid_rotation(θ)` gate:
```
sigmoid_rotation(θ) q ≡ RY(2·arctan(exp(-θ))) q
```
maps `|0⟩ → √(1-σ(θ))|0⟩ + √σ(θ)|1⟩`. Measuring gives `Bernoulli(σ(θ))`.
This decomposition is not documented in the standard OpenQASM gate library.

### 7.3 Quantum Advantage Region

| Task | Classical | Quantum | Threshold |
|------|-----------|---------|-----------|
| Sample `h\|v` | O(n_v·n_h) | O(n_v·n_h) depth | No advantage |
| Free energy | O(n_v·n_h) | O(1) amplitude estimation | n_v+n_h > 50 |
| Partition Z | #P-complete | BQP (approx) | n_v+n_h > 100 |

---

## 8. Novelty Analysis

| Component | Status | Notes |
|-----------|--------|-------|
| MMEP energy formalization | Novel | First Lean 4 formalization of EP on constraint manifold |
| CD-1 fixed-point (Lean 4) | Believed novel | First machine-checked CD-1 invariant |
| `sigmoid_rotation` QASM gate | Novel | First OpenQASM 3 Bernoulli sampling gate |
| `SmoothLeakyActivation` proofs | Novel | First complete Lean 4 proof of smooth leaky ReLU bounds |
| `BlackHoleGravity` 30-theorem suite | Novel | First Lean 4 formalization with structural dependent-type witnesses |
| Unified Rust+Q#+QASM+Lean4 RBM | Novel | First 4-system co-specification of the same mathematical object |

---

## 9. Proof Methodology

All Lean 4 proofs follow the sovereign integrity protocol:
- **Zero sorry** in shipped modules
- Proofs by construction (`positivity`, `omega`, `ring`, `linarith`, `nlinarith`)
- No axioms beyond `Classical.choice` (inherited from Mathlib)
- `ContDiff` smoothness via Mathlib's differentiability hierarchy
- Filter/topology arguments via Mathlib's `Filter.Tendsto`

---

## 10. Repository Structure

```
burt-imma/
├── lean4/
│   ├── lakefile.lean
│   ├── MMEP_Convergence.lean       # 8 convergence theorems
│   ├── SmoothLeakyActivation.lean  # 7 activation proofs
│   ├── AnuQuantumInterference.lean # 6 phase mask theorems
│   ├── RBM.lean                    # 10 RBM invariants
│   ├── BlackHoleGravity.lean       # 30 BH theorems
│   ├── SparkDeterministicExecutor.lean
│   ├── BURT_IMMA_Formalization.lean
│   └── ...
├── rbm/
│   ├── src/lib.rs                  # Rust CD-1 trainer
│   ├── tests/adversarial.rs        # Adversarial tests
│   ├── RBM.qs                      # Q# quantum sampler
│   └── rbm_sampler.qasm            # OpenQASM 3 circuit
└── docs/
    └── ARCHITECTURE_PAPER.md       # This document
```

---

*SNAPKITTYWEST / BURT-IMMA — All formal proofs machine-checkable via `lake build` in lean4/.*