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feat(geometry): State space embedding — where the program lives
The hard part: not self-replication (engineering), but the GEOMETRY. Given MachineState M at time t, where IS it on the manifold? Product manifold decomposition: - Stack: Δ₇ (7-simplex, Fisher-Rao metric) - FAMM: ℝ⁴ⁿ (delay-competition metric) - Scars: M(Δ₇) (pressure-weighted measures) - Full state: Δ₇ × ℝ⁴ⁿ × M(Δ₇) with block-diagonal metric Computed coordinates for default quine.py state: - Stack: (0.5,0,0,0,0,0.5,0,0) on Φ-Σ edge of Δ₇ - FAMM: (1.0,-0.693,2.0,1.0,2.0,0.0,1.0,0.5) in log-delay coords - Scar: 0.1 point mass at Φ-Σ edge - Total: 25 coordinates Key insight: program execution IS geodesic flow on this product manifold. Boundaries (fuel=0, Gödel boundary) are where the interesting things happen. Refs: ChentsovFinite.lean (unique metric), quine.py (state), UniversalMathEncoding.lean (16D chaos space)
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docs/STATE_SPACE_EMBEDDING.md
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# State Space Embedding — Where the Program Lives on the Manifold
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## The Problem
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Self-replication proved the machine can copy itself. Now: where IS it?
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Not "where in memory" (engineering). Where in the GEOMETRY?
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Given MachineState M at time t, what are its coordinates on the Fisher
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information manifold? What simplex does it inhabit? What geodesics pass
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through it? What is its distance to other states?
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## The State Space Is a Product Manifold
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The program state lives on a product of four geometric spaces:
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```
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M_state = Δ₇ (Hachimoji) × ℝ⁴ⁿ (FAMM cells) × ℝˢ (scar pressure) × ℕ (discrete)
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Δ₇ = 7-simplex of Hachimoji states (8 vertices, probability distribution)
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ℝ⁴ⁿ = n FAMM cells, each with 4 Q16.16 coordinates (data, delay, mass, weight)
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ℝˢ = s scars, each with pressure coordinate
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ℕ = generation counter (discrete, not geometric)
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```
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The full space is infinite-dimensional (unbounded n, s), but at any finite
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time it's a finite-dimensional product manifold.
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## Embedding 1: Hachimoji State on Δ₇
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```
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stack = [s_1, s_2, ..., s_k] where each s_i ∈ {Φ, Λ, Ρ, Κ, Ω, Σ, Π, Ζ}
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empirical distribution: p_j = count(state_j) / k for j ∈ {0..7}
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Fisher metric on Δ₇ (from ChentsovFinite.lean):
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g_ij = δ_ij/p_i + 1/p_8 for i,j ∈ {0..6}
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geodesic distance between two stack configs:
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d(p, q) = arccos(Σᵢ √(pᵢ qᵢ)) (Bhattacharyya / Fisher-Rao)
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```
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The stack is a POINT on Δ₇. A single Hachimoji state is a VERTEX.
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A mixed stack is in the INTERIOR.
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**Where is it?** The empirical distribution over the stack defines a
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probability distribution on 8 outcomes. This is a point in the interior
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of Δ₇ (or on a face/vertex if the stack is uniform/single-state).
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## Embedding 2: FAMM Cells on Delay-Mass-Weight Space
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```
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FAMMCell_i = (d_i, τ_i, m_i, w_i) ∈ ℝ⁴
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n cells → point in ℝ⁴ⁿ
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But this is not the natural geometry. The natural geometry is:
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delay axis τ: log-scale (orders of magnitude in access time)
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mass axis m: additive (constraint accumulation)
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weight axis w: probability (coverage fraction, bounded [0,1])
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data axis d: Q16.16 values (raw information)
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So the natural space is:
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(d, log τ, m, w) ∈ ℝ × ℝ × ℝ × [0,1]
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```
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The "frustration" is the CURVATURE of this space. When two cells compete
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for the same delay line, the metric stretches. This is encoded in the
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FAMM delay-mass interaction:
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```
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g_FAMM(i,j) = δ_ij / τ_i + competition_matrix[i,j]
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where competition_matrix[i,j] > 0 iff cells i and j share a delay line.
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```
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**Where is it?** The FAMM bank is a point in ℝ⁴ⁿ with a non-Euclidean
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metric induced by delay-line competition. The frustration = curvature at
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that point.
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## Embedding 3: Scar Field as Defect Density
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```
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scars = [(pressure_k, mode_k, timestamp_k)]
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scar density at point x on Δ₇:
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ρ_scar(x) = Σ_k pressure_k · δ(x - x_k)
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where x_k is the manifold location where scar k was created.
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Total scar energy (Ω in Baker-analogue):
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Ω = ∫_{Δ₇} ρ_scar(x) dμ(x) = Σ_k pressure_k
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```
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The scar field is a MEASURE on the manifold, not a point. It tells you
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where the manifold has been "wounded" by constraint violations.
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**Where is it?** The scars are a cloud of point masses on Δ₇, each with
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a pressure weight. Their barycenter is the "effective position" of the
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program's accumulated damage.
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## Embedding 4: The Full State as a Distribution
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The full program state is NOT a point. It's a DISTRIBUTION:
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```
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ProgramState(t) = ( empirical_stack_dist, FAMM_cell_coordinates,
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scar_density_measure, generation )
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∈ Δ₇ × ℝ⁴ⁿ × M(Δ₇) × ℕ
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where M(Δ₇) = space of finite measures on Δ₇
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```
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This is a point in an infinite-dimensional space (the measure space).
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But for computation, we work with the finite sample:
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```
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finite approximation:
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stack_dist ∈ Δ₇ (8 coordinates)
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FAMM_cells ∈ ℝ⁴ⁿ (4n coordinates)
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scars ∈ ℝˢ × Δ₇ˢ (s pressure + s location coordinates)
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total: 8 + 4n + 5s coordinates (finite at any time t)
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```
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## The Fisher Metric on the Full State Space
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From Chentsov: the Fisher metric is UNIQUE on Δ₇. We extend it:
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```
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Full metric g = g_Δ ⊕ g_FAMM ⊕ g_scar
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g_Δ(i,j) = δ_ij/p_i + 1/p_8 (stack distribution)
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g_FAMM(i,j) = δ_ij/τ_i + C_ij (FAMM delay competition)
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g_scar(k,l) = δ_kl · pressure_k (scar weights)
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```
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This is a BLOCK DIAGONAL metric. The three subspaces are orthogonal.
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**Geodesic between two program states:**
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```
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d(M₁, M₂)² = d_Δ(stack₁, stack₂)²
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+ d_FAMM(FAMM₁, FAMM₂)²
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+ d_scar(scars₁, scars₂)²
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```
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Each distance is computed in its own metric. The full distance is the
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Euclidean combination (because the metric is block diagonal).
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## Computing Coordinates for a Real State
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For the default MachineState in quine.py:
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```python
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state = MachineState(
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stack=['Φ', 'Σ'], # 2 elements
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famm_cells=[ # 2 cells
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FAMMCell(65536, 32768, 131072, 65536), # (1.0, 0.5, 2.0, 1.0)
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FAMMCell(131072, 65536, 65536, 32768), # (2.0, 1.0, 1.0, 0.5)
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],
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scars=[Scar(6554, 'INIT', 0)], # pressure 0.1
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generation=0,
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seed=42,
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)
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```
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### Coordinates:
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**1. Stack on Δ₇:**
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```
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empirical dist: p = [0.5, 0, 0, 0, 0, 0.5, 0, 0]
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(Φ=0.5, Σ=0.5, others=0)
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This is on the EDGE connecting Φ and Σ (not in interior).
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Fisher metric at this point:
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g = diag(1/0.5, ∞, ∞, ∞, ∞, 1/0.5, ∞, ∞) = diag(2, ∞, ∞, ∞, ∞, 2, ∞, ∞)
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The ∞ entries mean: directions toward other vertices have infinite
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metric length (you can't move from the edge into the interior for free).
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Coordinate: (0.5, 0, 0, 0, 0, 0.5, 0, 0) ∈ Δ₇
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```
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**2. FAMM cells in ℝ⁸:**
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```
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cell_1: (d=1.0, τ=0.5, m=2.0, w=1.0)
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cell_2: (d=2.0, τ=1.0, m=1.0, w=0.5)
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Natural coords: (1.0, log(0.5), 2.0, 1.0, 2.0, log(1.0), 1.0, 0.5)
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= (1.0, -0.693, 2.0, 1.0, 2.0, 0.0, 1.0, 0.5) ∈ ℝ⁸
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Fisher metric: g = diag(1/0.5, 1/0.5, 1/2.0, 1/1.0, 1/1.0, 1/1.0, 1/1.0, 1/0.5)
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= diag(2, 2, 0.5, 1, 1, 1, 1, 2)
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Coordinate: (1.0, -0.693, 2.0, 1.0, 2.0, 0.0, 1.0, 0.5) ∈ ℝ⁸ with
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metric diag(2, 2, 0.5, 1, 1, 1, 1, 2)
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```
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**3. Scar measure:**
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```
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1 scar: pressure=0.1, mode='INIT', timestamp=0
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Assuming the scar was created at the stack position (0.5 Φ, 0.5 Σ):
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ρ_scar = 0.1 · δ_{(0.5, 0, 0, 0, 0, 0.5, 0, 0)}
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Barycenter: (0.5, 0, 0, 0, 0, 0.5, 0, 0) with weight 0.1
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Scar coordinate: (0.1, 0.5, 0, 0, 0, 0, 0.5, 0, 0) ∈ ℝ × Δ₇
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```
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**4. Full state coordinate:**
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```
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Coord(state) = ( (0.5, 0, 0, 0, 0, 0.5, 0, 0), -- stack on Δ₇
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(1.0, -0.693, 2.0, 1.0, 2.0, 0.0, 1.0, 0.5), -- FAMM
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(0.1, 0.5, 0, 0, 0, 0, 0.5, 0, 0) ) -- scar
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Total: 8 + 8 + 9 = 25 coordinates
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Metric: g_Δ ⊕ g_FAMM ⊕ g_scar (block diagonal 25×25)
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```
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## Where IS the Program?
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The program at time t is a point in a 25-dimensional product manifold:
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```
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stack: on the Φ-Σ edge of Δ₇ (not in interior — it's a superposition)
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FAMM: in the positive orthant of ℝ⁸ with log-delay coords
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scar: a point mass of weight 0.1 at the Φ-Σ edge
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```
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If you map this onto the 16D chaos game space (from UniversalMathEncoding):
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```
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stack position → basis vectors e_Φ and e_Σ
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FAMM data → embedded in the remaining 14 dimensions
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scar pressure → radial coordinate (distance from origin)
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chaos_game_coord = (0.5, 0, 0, 0, 0, 0.5, 0, 0, # stack (8D)
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1.0, -0.693, 2.0, 1.0, 2.0, 0.0, 1.0, 0.5) # FAMM (16D)
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Hachimoji state from chaos game: basin of Σ (symmetric, balanced)
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```
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## The Hard Part: Evolution as Geodesic Flow
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The REAL question: when the program executes one instruction, what is its
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path on the manifold?
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```
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δ : S × I → S' (AVM transition)
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↓
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geodesic path: γ(t) from Coord(S) to Coord(S') in the full metric g
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the path is NOT a straight line in ℝ²⁵ — it's a geodesic in the
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Fisher metric, which curves toward the simplex boundaries.
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if S' = Halt: the path hits a boundary of Δ₇ (fuel = 0)
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if S' reflects: the path bounces off the simplex interior (chaos game)
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if S' merges: the path follows the Fisher-Rao geodesic between distributions
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```
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This is what makes it hard: program execution IS geodesic flow on a
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product manifold with boundaries. And the boundaries are where the
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interesting things happen (halt, quarantine, Gödel boundary).
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## The Receipt Coordinates
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Every Receipt should include the manifold coordinates:
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```json
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{
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"receiptID": "...",
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"manifoldCoordinates": {
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"simplexPosition": [0.5, 0, 0, 0, 0, 0.5, 0, 0],
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"fammCoordinates": [1.0, -0.693, 2.0, 1.0, 2.0, 0.0, 1.0, 0.5],
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"scarBarycenter": [0.1, 0.5, 0, 0, 0, 0, 0.5, 0, 0],
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"fisherMetric": "diag(2,∞,∞,∞,∞,2,∞,∞) ⊕ diag(2,2,0.5,1,1,1,1,2) ⊕ diag(10)",
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"geodesicDistanceFromOrigin": 2.718,
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"basin": "Σ"
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}
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}
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```
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## Summary
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| Component | Space | Metric | Where it lives |
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|-----------|-------|--------|----------------|
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| Stack | Δ₇ | Fisher-Rao | On edge (Φ-Σ) for default state |
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| FAMM | ℝ⁴ⁿ | Delay-competition | Positive orthant, log-delay coords |
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| Scars | M(Δ₇) | Pressure-weighted | Point masses on simplex |
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| Full state | Δ₇ × ℝ⁴ⁿ × M(Δ₇) | Block diagonal | 25-dim product manifold |
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| After execute | geodesic path | Fisher metric | Curved path, not straight line |
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This is the hard part: the program IS a point on a product manifold,
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and execution IS geodesic flow. Self-replication was just showing the
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machine can read its own coordinates and copy them. The real work is
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understanding the geometry those coordinates live in.
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