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Appendix C — SA ↔ PA Equivalences

Fabio Ghioni · Copia del 2026-09-18

Appendix C — SA ↔ PA Equivalences


This appendix provides a complete correspondence table between the Semantic Algebra (SA) and the Proportional Algebra (PA), demonstrating that the SA is a restriction of the PA to the decoherent space 𝒟 (Theorem 9.1).


Operators

SA Operator SA Definition PA Equivalent PA Definition Relationship
S (Strip) Extracts invariant from expression S (fibre-bundle projection) 𝒟 → ℐ × [0,1] Identical operation, now identified as projection of the fibre bundle
π (Re-contextualisation) Re-expresses invariant in target domain π (fibre-bundle section) ℐ × 𝔻 → 𝒟 Identical operation, now identified as section of the fibre bundle
S(π(ι,𝔻)) = ι (Round-trip) Analytical verification ERT Step 1 + Step 3 S then π component of the 4-step ERT SA round-trip is embedded in the PA's extended round-trip

7-Layer Architecture

SA Layer SA Name PA Region Removed by S? PA Interpretation
L1 Surface Syntax 𝒟 (domain encoding) ✅ Sequential linearisation of proportional vectors
L2 Lexical Domain 𝒟 (domain encoding) ✅ Domain-specific instantiation vocabulary
L3 Rhetorical Structure 𝕀 (identity filter) ✅ Dominant vector λ(I) of the expresser's Remir
L4 Cultural Frame K (context) ✅ Context operator restricting accessible field
L5 Structural Dynamic ℐ (invariant) ❌ Proportional relations within the expression
L6 Operational Invariant ℐ (invariant) ❌ The structural law — base point of the fibre bundle
L7 Meta-Systemic Position ℐ (invariant) ❌ Position in 𝒫 — the expression's location in the Proportional Space

R-Vocabulary

SA R-Value SA Name PA Component PA Value PA Interpretation
R = 1.0 Mutual ρ_R = 1.0 Full readiness Both parties structurally open — maximum ⊗
R = 0.8 Unilateral ρ_R = 0.8 Partial readiness One identity open, the other partially closed
R = 0.5 Projected ρ_R = 0.5 Self-referential Identity projects its own structure onto the content
R = 0.3 Instrumental ρ_R = 0.3 Extractive Identity uses the content for external purposes
R = 0.1 Performative ρ_R = 0.1 Surface only Identity produces the form without structural engagement
R = 0.0 Absent ρ_R = 0.0 No relation No resonance — ⊗ yields ∅

Coherence Formula

SA Component SA Weight PA Component PA Weight Notes
Internal coherence 0.25 𝓚_1 (internal consistency) 0.25 (within ⟨𝓚⁵⟩) Identical
Structural depth 0.20 𝓚_3 (depth preserved) 0.20 (within ⟨𝓚⁵⟩) SA measures depth of expression; PA measures depth relative to source
Transferability 0.20 𝓚_5 (generative capacity) 0.20 (within ⟨𝓚⁵⟩) SA's transferability ≈ PA's generative capacity
Discrimination 0.20 𝓚_2 (source alignment) 0.20 (within ⟨𝓚⁵⟩) SA's discrimination ≈ PA's source alignment + ERT Step 2
Predictive power 0.15 𝓚_4 (stability) 0.15 (within ⟨𝓚⁵⟩) SA's predictive power ≈ PA's stability under perturbation

Invariant Types

SA Type SA Name PA Interpretation
Type 1 Meta-systemic Invariant about the structure of 𝒫 itself
Type 2 Generative Invariant about Φ — laws governing collapse
Type 3a Structural-diagnostic Invariant about S — laws governing extraction
Type 3b Structural-dynamic Invariant about τ — laws governing pulsation
Type 4 Relational Invariant about ⊗ — laws governing resonance
Type 5 Processual Invariant about T(I) — laws governing trajectories
Type 6 Threshold/limit Invariant about θ — laws governing boundaries
Type 7 Emergent Invariant about Φ-emergence — laws governing recursive scaling
Type 8 Stabilising Invariant about 𝓚_4 — laws governing stability
Type 9a Recursive-boundary Invariant about the limit of recursive scaling
Type 9b Recursive-generative Invariant about the capacity to generate new levels
Type 10 Transcendent Invariant about the relation ℭ_h ↔ 𝒟 — laws governing the coherent/decoherent boundary
Type 11 Consciousness Invariant about 𝕀 — laws governing the identity as observer/operator

What SA Cannot Access (PA Extends)

Capability SA PA Why SA Cannot
Describe ℭ_h ❌ ✅ SA operates only on 𝒟
Measure ρ(C, I) ❌ ✅ SA has no access to C or I directly
Verify source fidelity (ERT Step 2) ❌ ✅ SA cannot compare E with its source C
Describe identity structure (Remir) ❌ ✅ SA has no formal model of identity
Generate shared fields (⊗) ❌ ✅ SA operates on single expressions
Generate time (τ) ❌ ✅ SA has no temporal operator
Track identity evolution (𝒰) ❌ ✅ SA has no identity-update mechanism