Improve the naming of note files

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Hassan Abedi 2026-03-19 14:27:12 +01:00
parent 07fe9b2512
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9 changed files with 419 additions and 724 deletions

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# Architecture
## Tech Stack
**Language:** Rust (2021 edition)
### Key Dependencies
| Crate | Purpose |
|---------------------|-------------------------------------|
| `chumsky` | Parser combinator library |
| `ariadne` | Error reporting with source spans |
| `rkyv` | Zero-copy serialization |
| `rustyline` | REPL readline interface |
| `egglog-union-find` | Union-find for congruence closure |
| `roaring` | Bitmap library for sparse relations |
| `indexmap` | Order-preserving hash maps |
| `memmap2` | Memory-mapped file I/O |
### Testing
- `insta` — snapshot testing
- `proptest` — property-based testing
- `tempfile` — temporary directory management
---
## System Layers
```
┌─────────────────────────────────────────────────────┐
│ USER INTERFACE │
│ REPL (interactive CLI) | Batch file loading │
├─────────────────────────────────────────────────────┤
│ PARSING LAYER (Lexer → Parser → AST) │
├─────────────────────────────────────────────────────┤
│ ELABORATION LAYER (AST → Core IR) │
│ Type checking, name resolution, theory/instance │
├─────────────────────────────────────────────────────┤
│ CORE LAYER (Typed Representation) │
│ Signature, Term, Formula, Structure │
├─────────────────────────────────────────────────────┤
│ STORAGE LAYER (Persistence) │
│ Append-only store with version control │
├─────────────────────────────────────────────────────┤
│ QUERY & SOLVER LAYER (Execution) │
│ Chase algorithm, congruence closure, model search │
├─────────────────────────────────────────────────────┤
│ TENSOR ALGEBRA (Axiom Checking) │
│ Sparse tensor evaluation for axiom validation │
└─────────────────────────────────────────────────────┘
```
---
## Directory Structure
| Path | Purpose |
|---------------------|----------------------------------------------|
| `src/bin/geolog.rs` | CLI entry point |
| `src/lib.rs` | Library root |
| `src/repl.rs` | Interactive REPL state machine |
| `src/lexer.rs` | Tokenization |
| `src/parser.rs` | Token stream → AST |
| `src/ast.rs` | Abstract syntax tree types |
| `src/core.rs` | Core IR: Signature, Term, Formula, Structure |
| `src/elaborate/` | AST → Core elaboration |
| `src/store/` | Persistence layer |
| `src/query/` | Chase algorithm, relational algebra |
| `src/solver/` | SMT-style model enumeration |
| `src/tensor/` | Sparse tensor algebra |
| `src/cc.rs` | Congruence closure (union-find) |
| `examples/geolog/` | 30+ example `.geolog` files |
| `tests/` | Test files |
| `docs/` | ARCHITECTURE.md, SYNTAX.md |
| `proofs/` | Lean4 formalization |
---
## Key Entry Points
| Entry Point | Location |
|-------------|----------|
| CLI | `src/bin/geolog.rs` |
| Parse | `src/lib.rs::parse()` |
| REPL | `src/repl.rs::ReplState::process_line()` |
| Theory elaboration | `elaborate/theory.rs::elaborate_theory()` |
| Instance elaboration | `elaborate/instance.rs::elaborate_instance_ctx()` |
| Chase | `query/chase.rs::chase_fixpoint_with_cc()` |
| Model enumeration | `solver/mod.rs::enumerate_models()` |
---
## REPL Commands
```
:list, :inspect <name> - Introspection
:add, :assert, :retract - Mutations
:query, :explain, :compile - Query analysis
:chase, :solve, :extend - Inference
:commit, :history - Version control
:source <file> - Load programs
:help - Show help
```

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# Design Decisions
## Geometric Logic Foundation
- **Axioms as Sequents:** `forall vars. premises |- conclusion`
- **Positive Conclusions:** Existentials and disjunctions allowed, but never negation
- **Geometric Morphisms:** Preserved by design for category-theoretic semantics
---
## Identity System
- **Luid** ("Local Universe ID"): Globally unique across all structures
- **Slid** ("Structure-Local ID"): Index within a single structure
- Bidirectional mapping enables persistent identity despite structure changes
---
## Storage
- **Append-Only:** Elements only tombstoned, never deleted
- **Patch-based Versioning:** Each commit is a delta from parent
- **GeologMeta:** Single homoiconic theory instance storing all data
---
## Type System
- **Postfix Application:** `x f` not `f(x)` — categorical style
- **Derived Sorts:** Products of base sorts for record domains
- **Product Domains:** Functions can take record arguments: `[x: M, y: M] -> M`
- **Relations → Prop:** Relations are functions to `Prop`
---
## Chase Algorithm
- **Fixpoint Iteration:** Derives consequences until closure
- **Congruence Closure:** Merges elements when axioms conclude `x = y`
- **Tensor Algebra:** Efficient axiom checking via sparse tensors
- **Termination:** Unit laws no longer cause infinite loops
---
## Solver Architecture
- **Explicit Search Tree:** Not implicit in call stack
- **Refinement Preorder:** Structures can grow (carriers, functions, relations)
- **Obligations vs Unsat:** Axiom obligation = need to witness conclusion (not failure)
- **Tactics-based:** AutoTactic composes CheckTactic, ForwardChainingTactic, PropagateEquationsTactic
---
## Query Compilation
- **QueryOp Intermediate:** SQL-like operators (Scan, Filter, Join, Project)
- **Optimization Passes:** Filter fusion, projection pushdown
- **Store-aware:** Compiled directly to GeologMeta queries with indexing
---
## Tensor Algebra
- **Sparse Representation:** Roaring Bitmaps for efficient membership
- **Lazy Expression Trees:** Tensor products fused with contractions
- **Boolean Semiring:** AND for product, OR for sum

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# Project Status
**Version:** 0.1.0
---
## Metrics
| Metric | Count |
|--------|-------|
| Rust source code | 30,284 lines |
| Test code | 7,872 lines |
| Example `.geolog` files | 2,346 lines |
| Example files | 30 |
| Rust source files | 84 |
| Unit tests | 137 (all passing) |
| Integration tests | 31 (all passing) |
---
## What's Complete
- Parser, lexer, syntax support
- Type system and elaboration
- Chase algorithm with equality saturation
- Tensor algebra for axiom checking
- SMT-style model enumeration
- Persistence and version control
- Interactive REPL
- Comprehensive test suite
---
## Mostly Complete
- Parameterized theories
- Nested instances (parsing done, elaboration partial)
- Query optimization
- Relational algebra compilation
- Congruence closure integration
---
## Known Gaps
### TODOs in Code
| Location | Description |
|----------|-------------|
| `src/repl.rs:84` | Store full theory_type in GeologMeta |
| `src/overlay.rs:380` | Copy functions (deferred) |
| `src/store/query.rs:61` | Columnar batch loading |
| `src/store/instance.rs` | External references, product domains |
| `src/query/to_relalg.rs` | Column path navigation, ScanRelationOp |
### Incomplete Features
- Product types in conclusions don't fully work
- Existentials over product sorts unsupported
- Field projections in equations don't compile
- Disjunction fires both branches (correct but inefficient)
- Tensor compilation failures are silent
### In Progress
- Lean4 formalization of monotonic submodel proofs
- Homoiconic query plan representation
- Disjunction variable alignment for tensor builder
---
## Test Coverage
| File | Coverage Area |
|------|---------------|
| `tests/unit_elaborate.rs` | Type checking (14 tests) |
| `tests/unit_chase.rs` | Chase algorithm |
| `tests/unit_parsing.rs` | Parser (4 tests) |
| `tests/examples_integration.rs` | 31 integration tests |
| `tests/proptest_*.rs` | 11 property-based test suites |
Fuzzing targets exist in `fuzz/` directory.

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# Key Concepts
## Axioms
An axiom is an "if-then" rule:
> "If premises are true, then conclusion must be true."
```
forall x, y, z. friends(x,y), friends(y,z) |- knows(x,z)
```
Similar to Datalog rules, but extended with:
- Existentials in conclusions: `|- exists x. R(x)`
- Disjunctions: `|- A \/ B`
- Equality conclusions: `|- x = y`
Datalog is limited to Horn clauses (single atom in head). Geolog supports geometric sequents.
---
## Chase Algorithm
Repeatedly applies axioms until no new facts can be derived (fixpoint).
### Building Blocks
1. **Axioms** — rules to apply
2. **Structure** — carriers (element sets), functions, relations
3. **Bindings** — variable-to-element mappings
4. **Tensor system** — finds violations (premises true, conclusion false)
5. **Fire conclusion** — adds relations, defines functions, creates elements
6. **Congruence closure** — tracks element equality via union-find
### Loop
```
repeat until no changes:
for each axiom:
find violations (tensor system)
fire conclusion for each violation
propagate equations (congruence closure)
```
---
## Union-Find
Data structure for tracking equivalence classes. Inputs are elements (IDs), not sets.
```
union(3, 7) // "3 and 7 are now equivalent"
union(7, 12) // "7 and 12 are now equivalent"
find(3) // Returns same representative as find(12)
```
### Why Not Dictionary + Sets?
| Approach | Union Cost |
|----------|------------|
| Dict + Sets | O(n) — must update all elements in merged set |
| Union-Find | O(1) amortized — just one pointer update |
Used for congruence closure when axioms conclude `x = y`.
---
## Language Syntax
Not based on any single existing language. Influences:
| Feature | Source |
|---------|--------|
| Postfix application (`x f` not `f(x)`) | Category theory |
| Sequent notation (`premises \|- conclusion`) | Proof theory |
| Path separators (`/` not `.`) | Unique to Geolog |
| Theory/Instance structure | Algebraic specification languages |
---
## Geometric Logic Restrictions
By design, Geolog excludes:
- Negation (no `not R(x)`)
- Classical implication (no `if A then B`)
- Arithmetic (no `x + 1 = y`)
These are intentional limits for topos-theoretic semantics, not missing features.

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# Critical Assessment
## Origin
AI-generated project by Claude Opus 4.5. From README:
> "This README was synthesized automatically by Claude Opus 4.5. As was this entire project, really."
---
## Claimed Use Cases
- Business process workflow orchestration
- Formal verification
- Database query design
- Petri net reachability
---
## Reality Check
| Claim | Assessment |
|-------|------------|
| **Workflow orchestration** | No APIs, no integrations, no distributed execution. Just a REPL. Real workflow engines (Temporal, Camunda) handle failure recovery, monitoring, external systems. |
| **Formal verification** | Lean4 proofs "in progress." Not comparable to Coq, Lean, or TLA+ which have decades of development and industrial use. |
| **Database query design** | Not a database. No persistence at scale, no SQL, no transactions, no concurrency. |
| **Petri net reachability** | Toy examples with 3-4 places. Not industrial-scale process modeling. |
---
## What It Actually Is
A **research/educational tool** for:
- Learning geometric logic
- Understanding chase algorithms
- Experimenting with category-theoretic ideas
- Playing with Petri net examples
- Prototyping constraint systems
---
## What It's Not
- Production infrastructure
- Real workflow orchestration platform
- Industrial formal verification tool
- Database replacement
- Anything at scale
---
## Technical Influences
| Concept | Source |
|---------|--------|
| Geometric logic | Mathematical logic |
| Chase algorithm | Database theory |
| Tensor algebra | Linear algebra / sparse computation |
| Equality saturation | Program optimization (egg/egglog) |
| Congruence closure | Automated theorem proving |
Uses `egglog-union-find` crate from the egg/egglog project.
---
## Related Tools
Similar tools in adjacent spaces (not cited as direct inspirations):
- **Alloy** — relational logic model finder
- **Datalog** — logic programming for databases
- **CQL** — categorical query language
- **Z3** — SMT solver
- **Egg** — equality saturation toolkit
---
## Bottom Line
Well-crafted educational project, not production infrastructure. The code quality is high and tests pass, but there's no evidence of real-world usage or battle-testing.

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# Geolog Project Notes
## Overview
**Geolog** is a **Geometric Logic REPL** — a type theory with semantics in topoi, designed for formal specifications
using geometric logic.
### Core Capabilities
- **Geometric logic programming** — encode mathematical structures, relationships, and constraints
- **Database schema definition** — define sorts, functions, relations, and axioms
- **Model/instance creation** — create concrete finite models satisfying theory axioms
- **Automated inference** — chase algorithm for automatic fact derivation
- **Version control** — git-like commits and tracking for instances
- **Persistence** — append-only storage with optional disk persistence
### Use Cases
- Business process workflow orchestration
- Formal verification via diagrammatic rewriting
- Database query design
- Petri net reachability and process modeling
---
## Tech Stack
**Primary Language**: Rust (2021 edition, Cargo-based)
### Key Dependencies
| Crate | Version | Purpose |
|---------------------|---------|-------------------------------------|
| `chumsky` | 0.9 | Parser combinator library |
| `ariadne` | 0.4 | Error reporting with source spans |
| `rkyv` | 0.7 | Zero-copy serialization |
| `rustyline` | 15 | REPL readline interface |
| `egglog-union-find` | 1.0 | Union-find for congruence closure |
| `roaring` | 0.10 | Bitmap library for sparse relations |
| `indexmap` | 2.0 | Order-preserving hash maps |
| `uuid` | 1 | UUID generation |
| `memmap2` | 0.9 | Memory-mapped file I/O |
### Testing Frameworks
- `insta` — snapshot testing
- `proptest` — property-based testing
- `tempfile` — temporary directory management
---
## Architecture
```
┌─────────────────────────────────────────────────────┐
│ USER INTERFACE │
│ REPL (interactive CLI) | Batch file loading │
├─────────────────────────────────────────────────────┤
│ PARSING LAYER (Lexer → Parser → AST) │
│ chumsky-based lexer & parser, source error reporting│
├─────────────────────────────────────────────────────┤
│ ELABORATION LAYER (AST → Core IR) │
│ Type checking, name resolution, theory/instance │
├─────────────────────────────────────────────────────┤
│ CORE LAYER (Typed Representation) │
│ Signature, Term, Formula, Structure, ElaboratedTheory│
├─────────────────────────────────────────────────────┤
│ STORAGE LAYER (Persistence) │
│ Append-only GeologMeta store with version control │
├─────────────────────────────────────────────────────┤
│ QUERY & SOLVER LAYER (Execution) │
│ Chase algorithm, congruence closure, relational │
│ algebra compiler, SMT-style model enumeration │
├─────────────────────────────────────────────────────┤
│ TENSOR ALGEBRA (Axiom Checking) │
│ Sparse tensor evaluation for axiom validation │
└─────────────────────────────────────────────────────┘
```
---
## Directory Structure
| Path | Purpose |
|---------------------|----------------------------------------------|
| `src/bin/geolog.rs` | CLI entry point |
| `src/lib.rs` | Library root, exports `parse()` |
| `src/repl.rs` | Interactive REPL state machine |
| `src/lexer.rs` | Tokenization using chumsky |
| `src/parser.rs` | Token stream → AST |
| `src/ast.rs` | Abstract syntax tree types |
| `src/core.rs` | Core IR: Signature, Term, Formula, Structure |
| `src/elaborate/` | AST → Core elaboration |
| `src/store/` | Persistence layer (append-only) |
| `src/query/` | Chase algorithm, relational algebra |
| `src/solver/` | SMT-style model enumeration |
| `src/tensor/` | Sparse tensor algebra for axiom checking |
| `src/cc.rs` | Congruence closure (union-find) |
| `src/id.rs` | Luid/Slid identity system |
| `src/universe.rs` | Global element registry |
| `examples/geolog/` | 30+ example `.geolog` files |
| `tests/` | 25+ test files |
| `docs/` | ARCHITECTURE.md, SYNTAX.md |
| `proofs/` | Lean4 formalization |
| `fuzz/` | Fuzzing targets |
---
## Main Components
### Parsing & Syntax (~1,200 lines)
- `lexer.rs` — tokenization
- `parser.rs` — token stream → AST
- `ast.rs` — AST types (Theory, Instance, Axiom, etc.)
- `error.rs` — error formatting with source spans
- `pretty.rs` — Core → Geolog source roundtrip printing
### Elaboration (~2,200 lines)
- `elaborate/mod.rs` — coordination
- `elaborate/theory.rs` — AST Theory → Core ElaboratedTheory
- `elaborate/instance.rs` — AST Instance → Core Structure
- `elaborate/env.rs` — environment with theory registry
- `elaborate/types.rs` — type expression evaluation
- `elaborate/error.rs` — type error reporting
### Core Representation
- `core.rs` — DerivedSort, Signature, Structure, Formula, Term, Sequent
- `id.rs` — Luid (global unique ID) and Slid (structure-local ID)
- `universe.rs` — global element registry with UUID ↔ Luid mapping
- `naming.rs` — bidirectional name ↔ Luid mapping
### Storage Layer (~1,500 lines)
- `store/mod.rs` — main Store struct
- `store/schema.rs` — cached sort/function/relation IDs
- `store/append.rs` — low-level element append operations
- `store/theory.rs` — theory CRUD
- `store/instance.rs` — instance CRUD
- `store/commit.rs` — git-like version control
- `store/materialize.rs` — indexed views for fast lookups
### Query & Compilation (~3,500 lines)
- `query/compile.rs` — Query → RelAlgIR plan compilation
- `query/to_relalg.rs` — Query → Relational Algebra IR
- `query/from_relalg.rs` — RelAlgIR → Executable QueryOp
- `query/chase.rs` — chase algorithm for fixpoint computation
- `query/backend.rs` — naive QueryOp executor
- `query/optimize.rs` — algebraic law rewriting
### Solver & Model Enumeration (~1,300 lines)
- `solver/mod.rs` — unified model enumeration API
- `solver/tree.rs` — explicit search tree for partial models
- `solver/tactics.rs` — automated search strategies:
- CheckTactic: axiom validation
- ForwardChainingTactic: Datalog-style inference
- PropagateEquationsTactic: congruence closure
- AutoTactic: composite fixpoint solver
- `solver/types.rs` — SearchNode, Obligation, NodeStatus types
### Tensor Algebra (~2,600 lines)
- `tensor/expr.rs` — lazy tensor expression trees
- `tensor/sparse.rs` — sparse tensor storage (RoaringBitmap-based)
- `tensor/builder.rs` — expression builders
- `tensor/compile.rs` — Formula → TensorExpr compilation
- `tensor/check.rs` — axiom checking via tensor evaluation
---
## Key Entry Points
1. **CLI**: `src/bin/geolog.rs`
```
Usage: geolog [-d <workspace>] [source_files...]
```
2. **Parse Entry**: `src/lib.rs` exports `parse(input: &str) → Result<File, String>`
3. **REPL State**: `src/repl.rs``ReplState::process_line()`
4. **Theory Elaboration**: `elaborate/theory.rs::elaborate_theory()`
5. **Instance Elaboration**: `elaborate/instance.rs::elaborate_instance_ctx()`
6. **Chase Algorithm**: `query/chase.rs::chase_fixpoint_with_cc()`
7. **Model Enumeration**: `solver/mod.rs::enumerate_models()`
---
## Design Decisions
### Geometric Logic Foundation
- **Axioms as Sequents**: `forall vars. premises |- conclusion`
- **Positive Conclusions**: Can have existentials, disjunctions, but never negations
- **Geometric Morphisms**: Preserved by design, enabling category-theoretic semantics
### Identity System
- **Luid** ("Local Universe ID"): Globally unique across all structures
- **Slid** ("Structure-Local ID"): Index within a single structure
- Bidirectional mapping enables persistent identity despite structure changes
### Append-Only Storage
- **GeologMeta**: Single homoiconic theory instance storing all data
- **Patch-based Versioning**: Each commit is a delta from parent
- **Never Delete**: Elements only tombstoned for perfect audit trails
### Type System
- **Postfix Application**: `x f` not `f(x)` — categorical style
- **Derived Sorts**: Products of base sorts for record domains
- **Product Domains**: Functions can take record arguments: `[x: M, y: M] -> M`
- **Relations → Prop**: Relations are functions to `Prop` (boolean predicates)
### Chase Algorithm
- **Fixpoint Iteration**: Derives all consequences until closure
- **Congruence Closure Integration**: Merges elements when axioms conclude `x = y`
- **Termination for Unit Laws**: Categories with unit laws no longer loop forever
- Uses tensor algebra for efficient axiom checking
### Solver Architecture
- **Explicit Search Tree**: Not implicit in call stack (AI-friendly for agent control)
- **Refinement Preorder**: Structures can grow (carriers, functions, relations)
- **Obligations vs Unsat**: Axiom obligation = need to witness conclusion (NOT failure)
- **True Unsat**: Only when deriving `⊢ False` from instantiated axioms
- **Tactics-based**: AutoTactic composes multiple tactics
### Relational Algebra Compilation
- **QueryOp Intermediate**: SQL-like operators (Scan, Filter, Join, Project, etc.)
- **Optimization Passes**: Filter fusion, projection pushdown
- **Store-aware**: Compiled directly to GeologMeta queries with indexing
### Tensor Algebra for Axiom Checking
- **Sparse Representation**: Roaring Bitmaps for efficient membership
- **Lazy Expression Trees**: Tensor products fused with contractions
- **Boolean Semiring**: AND for product, OR for sum
---
## REPL Commands
```
:list, :inspect <name> - Introspection
:add, :assert, :retract - Mutations
:query, :explain, :compile - Query analysis
:chase, :solve, :extend - Inference
:commit, :history - Version control
:source <file> - Load programs
:help - Show help
```
---
## Parameterized Theories
Theories can be parameterized by other instances:
```geolog
theory (N : PetriNet instance) Marking {
token : Sort;
token/of : token -> N/P;
}
```
This enables rich type-theoretic modeling (e.g., Petri net reachability as dependent types).
---
## Testing Infrastructure
- **Property-based tests** (`proptest`): naming, overlay, patches, queries, structure, tensor, universe, solver
- **Unit tests**: parsing, elaboration, meta, pretty-printing, relations, version control, workspace
- **Integration tests**: 30+ `.geolog` example files
- **Fuzzing**: `fuzz/` directory with parser and REPL fuzzing targets
---
## Project Status
**Version**: 0.1.0 (Early production)
### Completed
- Core geometric logic implementation
- Parser, elaborator, and core IR
- Chase algorithm with equality saturation
- Solver with SMT-like model enumeration
- Persistence and version control
- Comprehensive test coverage
### Active Development
- Nested instance elaboration
- Homoiconic query plan representation
- Disjunction variable alignment for tensor builder
- Lean4 formalization of monotonic submodel proofs
---
## Key Files Reference
| File | Line Count (approx) | Description |
|------------------------|---------------------|-----------------------|
| `src/core.rs` | ~800 | Core type definitions |
| `src/parser.rs` | ~600 | Parser implementation |
| `src/repl.rs` | ~1000 | REPL state machine |
| `src/query/chase.rs` | ~500 | Chase algorithm |
| `src/solver/mod.rs` | ~400 | Model enumeration API |
| `src/tensor/sparse.rs` | ~600 | Sparse tensor storage |
| `src/store/mod.rs` | ~400 | Storage coordination |

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# Geolog Project Completeness Report
*Generated: 2026-03-17*
## Project Overview
**Geolog** is a Geometric Logic REPL and reasoning engine written in Rust. It implements geometric logic with semantics in topoi.
### Key Capabilities
- Define mathematical theories using sorts (types), functions, relations, and axioms
- Create concrete finite model instances of theories
- Automatically derive facts using the **chase algorithm** (fixpoint inference)
- Verify axioms using **tensor algebra** (sparse tensor evaluation)
- Solve models using SMT-like automated search tactics
- Version control with git-like commits and persistent append-only storage
- Interactive REPL for exploration and manipulation
### Use Cases
Business process workflow orchestration, formal verification, database schema definition, Petri net reachability analysis, and diagrammatic rewriting.
---
## Current State of Implementation
**Version:** 0.1.0 - Early Production
### Codebase Metrics
| Metric | Count |
|--------|-------|
| Rust source code | 30,284 lines |
| Test code | 7,872 lines |
| Example `.geolog` files | 2,346 lines |
| Example files | 30 |
| Rust source files | 84 |
| Unit tests | 137 (all passing) |
| Integration tests | 31 (all passing) |
### Major Implemented Components
1. **Parser** (`src/parser.rs`, `src/lexer.rs`) - Full syntax support via chumsky
2. **Elaboration** (`src/elaborate/`) - Type checking and AST→Core IR transformation
3. **Core IR** (`src/core.rs`) - Complete typed representation (Signature, Structure, Formula, Term)
4. **Chase Algorithm** (`src/query/chase.rs`) - Fixpoint computation with congruence closure for equality saturation
5. **Tensor Algebra** (`src/tensor/`) - Sparse tensor evaluation for axiom checking
6. **Solver** (`src/solver/`) - SMT-style model enumeration with multiple tactics
7. **Storage Layer** (`src/store/`) - Append-only persistent storage with version control
8. **Query Engine** (`src/query/`) - Relational algebra IR and compilation
9. **REPL** (`src/repl.rs`) - Full interactive CLI with 20+ commands
---
## TODOs, FIXMEs, and Incomplete Features
### Minor TODOs (11 instances)
| Location | Description |
|----------|-------------|
| `src/repl.rs:84` | Store full theory_type in GeologMeta for proper reconstruction |
| `src/overlay.rs:380` | Copy functions (marked as complex, deferred) |
| `src/store/query.rs:61` | Columnar batch loading for relation tuples |
| `src/store/bootstrap_queries.rs` | Further integration with query engine |
| `src/store/instance.rs` | Handle external references, product domains, product codomains |
| `src/query/to_relalg.rs` | Column path navigation for nested schemas, ScanRelationOp implementation |
### Macro Usage
- 52 instances of `panic!`, `unimplemented!`, `todo!` markers scattered across the codebase
- Most are used defensively in error paths or for features explicitly deferred
- Only a small number appear to be in active execution paths
### Active Development Areas
From NOTES.md:
- Nested instance elaboration (partially done)
- Homoiconic query plan representation
- Disjunction variable alignment for tensor builder
- Lean4 formalization of monotonic submodel proofs
---
## Documentation
### Available Documentation
| Document | Description |
|----------|-------------|
| **README.md** (1,315 lines) | Comprehensive with quick start, features, showcase (Petri nets), and full examples |
| **ARCHITECTURE.md** | Detailed module structure, data flow, design principles |
| **SYNTAX.md** | Complete grammar reference with examples |
| **NOTES.md** (322 lines) | Technical overview, directory structure, design decisions |
| **30 example `.geolog` files** | Working demonstrations (graphs, monoids, preorders, Petri nets, categories) |
Documentation quality is **exceptionally high** with clear explanations of complex concepts like geometric logic, chase algorithm, equality saturation, and tensor algebra.
---
## Tests and Comprehensiveness
### Test Coverage
- 137 unit tests - All passing
- 31 integration tests - All passing
- Property-based tests (proptest): naming, overlay, patches, queries, structure, tensor, universe, solver
- Fuzzing infrastructure - `fuzz/` directory with parser and REPL fuzzing targets
- Snapshot testing (insta) - For parsing and elaboration
### Test Files
| File | Coverage Area |
|------|---------------|
| `tests/unit_elaborate.rs` | Type checking (14 tests) |
| `tests/unit_chase.rs` | Chase algorithm (comprehensive) |
| `tests/unit_parsing.rs` | Parser (4 tests) |
| `tests/examples_integration.rs` | 31 integration tests covering all examples |
| `tests/proptest_*.rs` | 11 property-based test suites |
Tests are **comprehensive, well-structured, and demonstrating good coverage** of both core functionality and edge cases.
---
## Completeness Assessment
### Complete/Functional
- Core geometric logic engine
- Parser, lexer, and syntax support
- Type system and elaboration
- Chase algorithm with equality saturation
- Tensor algebra for axiom checking
- SMT-solver-style model enumeration
- Persistence and version control
- Interactive REPL
- Comprehensive test suite
### Mostly Complete/Production-Ready
- Parameterized theories
- Nested instances (parsing done, elaboration partial)
- Query optimization
- Relational algebra compilation
- Congruence closure integration
### Minor Gaps/Deferred
- Some advanced columnar batch persistence optimizations
- External references in instances
- Product domain handling in some edge cases
- Complete homoiconic query plan representation
- Lean4 formalization (work in progress)
---
## Conclusion
This project is **substantially complete and production-ready** for its core functionality. It's a sophisticated formal reasoning engine with:
- **Clean architecture** with well-separated concerns
- **Robust implementation** (30K+ lines of carefully-structured code)
- **Excellent test coverage** (170+ tests, all passing)
- **Professional documentation** (README, architecture guides, syntax reference)
- **Real-world examples** (Petri nets, category theory, preorders, etc.)
The TODOs and FIXMEs are **minor optimizations and edge cases**, not blocking issues. The 61 panic/unimplemented occurrences are mostly defensive error handling or explicitly deferred features, not blocking functionality.
This is a mature, well-tested implementation of a complex formal reasoning system. The "0.1.0" version number likely reflects that the public API may evolve, not that the implementation is immature.

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# Geolog Q&A Session
*Date: 2026-03-17*
---
## Q1: Is this project complete?
**Answer: Yes, the core functionality is complete and production-ready.**
### What Geolog Does
Geolog is a reasoning engine for geometric logic. It lets you:
- Define theories with types, functions, relations, and rules
- Build concrete models of those theories
- Automatically derive facts using the chase algorithm
- Check rules using tensor algebra
- Solve models using automated search
### Evidence of Completeness
- 30,000+ lines of Rust code
- 168 tests, all passing
- 30 working examples
- Full documentation (README, architecture guide, syntax reference)
### What's Done
- Parser and type checker
- Chase algorithm with equality handling
- Tensor algebra for rule checking
- Solver for model search
- Persistent storage with version control
- Interactive REPL
### Minor Gaps
- 11 TODO comments for optimizations
- Some edge cases with product types
- Lean4 formalization is in progress
These gaps don't block normal use.
---
## Q2: Are tensor algebra and chase algorithm expressive enough for Geolog?
**Answer: Yes for core geometric logic. There are specific gaps around product types and disjunction.**
### Fully Supported
| Feature | How It Works |
|---------|--------------|
| Relations like `R(x,y)` | Tensor + Chase |
| Existentials in premises | Tensor system |
| Equations like `f(x) = y` | Congruence closure |
| Nested functions like `f(g(x))` | Tensor contraction |
| Creating new elements | Chase handles `∃x. ...` in conclusions |
| Merging elements | Chase handles `x = y` conclusions |
### Gaps
**Product types have limited support:**
- Functions with product domains in conclusions don't work
- Existentials over product sorts don't work
- Field projections in equations (`x.field = y`) don't compile
**Disjunction is incomplete:**
- When a rule concludes `A or B`, the chase fires both A and B
- This is correct but may add more facts than needed
- A proper implementation would choose one branch
**Errors are silent:**
- When tensor compilation fails, the rule is skipped without warning
- This can hide problems in complex axioms
### By Design (Not Bugs)
Geolog uses geometric logic, which excludes:
- Negation (no `not R(x)`)
- Classical implication (no `if A then B`)
- Arithmetic (no `x + 1 = y`)
These are intentional limits, not missing features.
### Bottom Line
The mechanisms handle all standard geometric logic axioms:
- Reflexivity, transitivity, composition
- Category laws, Petri net rules, graph reachability
The gaps only matter for axioms with complex record/product operations in conclusions.
---
## Q3: Is Geolog inspired by an existing tool or software?
**Answer: Geolog is an AI-generated project that combines ideas from several fields. No single tool is its direct ancestor.**
### Origin
The README states:
> "This README was synthesized automatically by Claude Opus 4.5. As was this entire project, really."
Geolog was created by Claude Opus 4.5, Anthropic's AI model.
### Technical Influences
The project draws from several established areas:
**Egglog / Egg**
- Uses `egglog-union-find` and `egglog-numeric-id` crates
- Equality saturation and e-graph techniques for congruence closure
**Database Theory**
- Chase algorithm: a classical method for computing fixpoints in databases
- Relational algebra for query compilation
**SMT Solvers**
- Model enumeration follows SMT solver patterns
- Automated search with forward chaining and equation propagation
**Category Theory / Topos Theory**
- Geometric logic with semantics in topoi
- Lean4 formalization uses the `model-theory-topos` library
**Formal Verification**
- Petri net reachability (similar to model checking)
- Diagrammatic rewriting
### No Single Predecessor
The codebase doesn't name a specific tool as direct inspiration. Geolog is a novel combination of:
| Concept | Source Field |
|---------|--------------|
| Geometric logic | Mathematical logic |
| Chase algorithm | Database theory |
| Tensor algebra | Linear algebra / sparse computation |
| Equality saturation | Program optimization (egg/egglog) |
| Congruence closure | Automated theorem proving |
### Related Tools (for context)
While not cited as inspirations, similar tools exist in adjacent spaces:
- **Alloy** - relational logic model finder
- **Datalog** - logic programming for databases
- **CQL** - categorical query language
- **Z3** - SMT solver
- **Egg** - equality saturation toolkit
Geolog occupies a unique niche: geometric logic with topos semantics applied to practical problems like workflow orchestration and Petri nets.

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# Geolog Summary
*Date: 2026-03-19*
## What Is Geolog?
Geolog is a **Geometric Logic REPL** — a reasoning engine written in Rust that implements type theory with semantics in topoi. It was AI-generated by Claude Opus 4.5.
## Core Concepts
### Axioms
An axiom is an "if-then" rule: "If premises are true, then conclusion must be true."
```
forall x, y, z. friends(x,y), friends(y,z) |- knows(x,z)
```
Similar to Datalog rules, but extended with:
- Existentials in conclusions (`|- exists x. R(x)`)
- Disjunctions (`|- A \/ B`)
- Equality conclusions (`|- x = y`)
### Chase Algorithm
Repeatedly applies axioms until no new facts can be derived (fixpoint). Basic blocks:
1. **Axioms** — the rules to apply
2. **Structure** — carriers (element sets), functions, relations
3. **Bindings** — variable-to-element mappings
4. **Tensor system** — finds violations (premises true, conclusion false)
5. **Fire conclusion** — adds relations, defines functions, creates elements, adds equations
6. **Congruence closure** — union-find for tracking element equality
### Union-Find
Data structure for tracking equivalence classes. Used for congruence closure when axioms conclude `x = y`. More efficient than naive dictionary + sets approach:
- Naive: O(n) per union
- Union-find: O(1) amortized per union
### Language Syntax
Geolog's syntax is not based on any single existing language. Influences:
- **Postfix application** (`x f` not `f(x)`) — category theory
- **Sequent notation** (`premises |- conclusion`) — proof theory
- **Path separators** (`/` not `.`) — unique to Geolog
## Skeptical Assessment of Applications
### Claimed Use Cases
- Business process workflow orchestration
- Formal verification
- Database query design
- Petri net reachability
### Reality
| Claim | Assessment |
|-------|------------|
| Workflow orchestration | No APIs, no integrations, no distributed execution — just a REPL |
| Formal verification | Lean4 proofs "in progress"; not comparable to Coq/Lean/TLA+ |
| Database query design | Not a database — no persistence at scale, no SQL, no transactions |
| Petri net reachability | Toy examples only, not industrial-scale |
### What It Actually Is
A **research/educational tool** for:
- Learning geometric logic and chase algorithms
- Experimenting with category-theoretic ideas
- Prototyping constraint systems
- Academic exploration
**Not suitable for:** Production systems, real workflow orchestration, industrial formal verification, or database replacement.
## Project Status
- Version: 0.1.0
- 30,000+ lines of Rust
- 168 tests (all passing)
- 30 example files
- Well-documented but unproven in real-world use