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vendor/ruvector/examples/prime-radiant/docs/ddd/domain-model.md
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# Prime-Radiant Domain Model
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## Overview
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Prime-Radiant is a mathematical framework for AI interpretability, built on rigorous foundations from algebraic topology, category theory, and quantum mechanics. This document describes the domain model using Domain-Driven Design (DDD) principles.
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---
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## Bounded Contexts
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### 1. Cohomology Context
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**Purpose**: Analyze topological structure of representations and detect coherence failures.
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#### Aggregates
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**Sheaf** (Aggregate Root)
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- Contains: Presheaf, Sections, RestrictionMaps
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- Invariants: Gluing axioms, locality conditions
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- Behavior: Compute cohomology, detect obstructions
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**ChainComplex**
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- Contains: ChainGroups, BoundaryMaps
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- Invariants: d^2 = 0 (boundary of boundary is zero)
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- Behavior: Compute homology groups
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#### Value Objects
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- `Section`: Data over an open set
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- `RestrictionMap`: Linear map between stalks
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- `BettiNumbers`: Topological invariants
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- `PersistenceDiagram`: Multi-scale topology
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#### Domain Events
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- `CoherenceViolationDetected`: When H^1 is non-trivial
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- `TopologyChanged`: When underlying graph structure changes
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- `SectionUpdated`: When local data is modified
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---
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### 2. Category Context
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**Purpose**: Model compositional structure and preserve mathematical properties.
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#### Aggregates
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**Category** (Aggregate Root)
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- Contains: Objects, Morphisms
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- Invariants: Identity, associativity
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- Behavior: Compose morphisms, verify laws
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**Topos** (Aggregate Root)
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- Contains: Category, SubobjectClassifier, Products, Exponentials
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- Invariants: Finite limits, exponentials exist
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- Behavior: Internal logic, subobject classification
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#### Entities
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- `Object`: An element of the category
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- `Morphism`: A transformation between objects
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- `Functor`: Structure-preserving map between categories
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- `NaturalTransformation`: Morphism between functors
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#### Value Objects
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- `MorphismId`: Unique identifier
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- `ObjectId`: Unique identifier
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- `CompositionResult`: Result of morphism composition
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#### Domain Events
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- `MorphismAdded`: New morphism in category
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- `FunctorApplied`: Functor maps between categories
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- `CoherenceVerified`: Axioms confirmed
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---
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### 3. HoTT Context (Homotopy Type Theory)
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**Purpose**: Provide type-theoretic foundations for proofs and equivalences.
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#### Aggregates
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**TypeUniverse** (Aggregate Root)
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- Contains: Types, Terms, Judgments
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- Invariants: Type formation rules
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- Behavior: Type checking, univalence
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**Path** (Entity)
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- Properties: Start, End, Homotopy
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- Invariants: Endpoints match types
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- Behavior: Concatenation, inversion, transport
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#### Value Objects
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- `Type`: A type in the universe
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- `Term`: An element of a type
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- `Equivalence`: Bidirectional map with proofs
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- `IdentityType`: The type of paths between terms
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#### Domain Services
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- `PathInduction`: J-eliminator for paths
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- `Transport`: Move values along paths
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- `Univalence`: Equivalence = Identity
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---
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### 4. Spectral Context
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**Purpose**: Analyze eigenvalue structure and spectral invariants.
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#### Aggregates
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**SpectralDecomposition** (Aggregate Root)
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- Contains: Eigenvalues, Eigenvectors
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- Invariants: Orthogonality, completeness
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- Behavior: Compute spectrum, effective dimension
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#### Value Objects
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- `Eigenspace`: Subspace for eigenvalue
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- `SpectralGap`: Distance between eigenvalues
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- `SpectralFingerprint`: Comparison signature
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- `ConditionNumber`: Numerical stability measure
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#### Domain Services
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- `LanczosIteration`: Efficient eigenvalue computation
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- `CheegerAnalysis`: Spectral gap and graph cuts
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---
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### 5. Causal Context
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**Purpose**: Implement causal abstraction for mechanistic interpretability.
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#### Aggregates
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**CausalModel** (Aggregate Root)
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- Contains: Variables, Edges, StructuralEquations
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- Invariants: DAG structure (no cycles)
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- Behavior: Intervention, counterfactual reasoning
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**CausalAbstraction** (Aggregate Root)
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- Contains: LowModel, HighModel, VariableMapping
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- Invariants: Interventional consistency
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- Behavior: Verify abstraction, compute IIA
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#### Entities
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- `Variable`: A node in the causal graph
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- `Intervention`: An action on a variable
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- `Circuit`: Minimal subnetwork for behavior
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#### Value Objects
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- `StructuralEquation`: Functional relationship
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- `InterventionResult`: Outcome of intervention
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- `AlignmentScore`: How well mechanisms match
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#### Domain Events
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- `InterventionApplied`: Variable was modified
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- `CircuitDiscovered`: Minimal mechanism found
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- `AbstractionViolation`: Models disagree under intervention
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---
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### 6. Quantum Context
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**Purpose**: Apply quantum-inspired methods to representation analysis.
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#### Aggregates
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**QuantumState** (Aggregate Root)
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- Contains: Amplitudes
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- Invariants: Normalization
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- Behavior: Measure, evolve, entangle
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**DensityMatrix** (Aggregate Root)
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- Contains: Matrix elements
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- Invariants: Positive semi-definite, trace 1
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- Behavior: Entropy, purity, partial trace
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#### Value Objects
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- `Entanglement`: Correlation measure
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- `TopologicalInvariant`: Robust property
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- `BerryPhase`: Geometric phase
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#### Domain Services
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- `EntanglementAnalysis`: Compute entanglement measures
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- `TDAService`: Topological data analysis
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---
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## Cross-Cutting Concerns
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### Error Handling
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All contexts use a unified error type hierarchy:
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```rust
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pub enum PrimeRadiantError {
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Cohomology(CohomologyError),
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Category(CategoryError),
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HoTT(HoTTError),
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Spectral(SpectralError),
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Causal(CausalError),
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Quantum(QuantumError),
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}
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```
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### Numerical Precision
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- Default epsilon: 1e-10
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- Configurable per computation
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- Automatic condition number checking
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### Serialization
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All value objects and aggregates implement:
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- `serde::Serialize` and `serde::Deserialize`
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- Custom formats for mathematical objects
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---
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## Context Map
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```
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┌─────────────────────────────────────────────────────────────────┐
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│ Prime-Radiant Core │
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├─────────────────────────────────────────────────────────────────┤
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│ │
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│ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ │
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│ │ Cohomology │────▶│ Category │────▶│ HoTT │ │
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│ │ Context │ │ Context │ │ Context │ │
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│ └─────────────┘ └─────────────┘ └─────────────┘ │
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│ │ │ │ │
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│ │ │ │ │
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│ ▼ ▼ ▼ │
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│ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ │
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│ │ Spectral │────▶│ Causal │────▶│ Quantum │ │
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│ │ Context │ │ Context │ │ Context │ │
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│ └─────────────┘ └─────────────┘ └─────────────┘ │
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│ │
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└─────────────────────────────────────────────────────────────────┘
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Relationships:
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─────────────
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Cohomology ──[U]──▶ Category : Sheaves are presheaves + gluing (Upstream/Downstream)
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Category ──[U]──▶ HoTT : Categories model type theory
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Spectral ──[S]──▶ Cohomology: Laplacian eigenvalues for cohomology (Shared Kernel)
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Causal ──[C]──▶ Category : Causal abstraction as functors (Conformist)
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Quantum ──[P]──▶ Category : Quantum channels as morphisms (Partnership)
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```
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---
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## Ubiquitous Language
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| Term | Definition |
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|------|------------|
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| **Sheaf** | Assignment of data to open sets satisfying gluing axioms |
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| **Cohomology** | Measure of obstruction to extending local sections globally |
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| **Morphism** | Structure-preserving map between objects |
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| **Functor** | Structure-preserving map between categories |
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| **Path** | Continuous map from interval, proof of equality in HoTT |
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| **Equivalence** | Bidirectional map with inverse proofs |
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| **Spectral Gap** | Difference between consecutive eigenvalues |
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| **Intervention** | Fixing a variable to a value (do-operator) |
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| **Entanglement** | Non-local correlation in quantum states |
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| **Betti Number** | Dimension of homology group |
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---
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## Implementation Guidelines
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### Aggregate Design
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1. Keep aggregates small and focused
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2. Use value objects for immutable data
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3. Enforce invariants in aggregate root
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4. Emit domain events for state changes
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### Repository Pattern
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Each aggregate root has a repository:
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```rust
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pub trait SheafRepository {
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fn find_by_id(&self, id: SheafId) -> Option<Sheaf>;
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fn save(&mut self, sheaf: Sheaf) -> Result<(), Error>;
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fn find_by_topology(&self, graph: &Graph) -> Vec<Sheaf>;
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}
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```
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### Factory Pattern
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Complex aggregates use factories:
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```rust
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pub struct SheafFactory {
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pub fn from_neural_network(network: &NeuralNetwork) -> Sheaf;
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pub fn from_knowledge_graph(kg: &KnowledgeGraph) -> Sheaf;
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}
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```
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### Domain Services
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Cross-aggregate operations use services:
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```rust
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pub struct CoherenceService {
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pub fn check_global_consistency(sheaf: &Sheaf) -> CoherenceReport;
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pub fn optimize_sections(sheaf: &mut Sheaf) -> OptimizationResult;
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}
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```
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