---
license: lgpl-2.1
task_categories:
  - text-generation
  - feature-extraction
language:
  - en
tags:
  - theorem-proving
  - formal-methods
  - why3
  - verification
  - smt
size_categories:
  - 1K<n<10K
dataset_info:
  features:
  - {name: statement, dtype: string}
  - {name: proof, dtype: string}
  - {name: type, dtype: string}
  - {name: symbolic_name, dtype: string}
  - {name: library, dtype: string}
  - {name: filename, dtype: string}
  - {name: imports, list: string}
  - {name: deps, list: string}
  - {name: docstring, dtype: string}
  - {name: source_url, dtype: string}
  - {name: commit, dtype: string}
  splits:
  - {name: train, num_examples: 9558}
  config_name: default
configs:
- config_name: default
  data_files:
  - split: train
    path: data/train-*
---

# Why3

A structured dataset of lemmas, functions, and predicates from **Why3**, a platform for deductive program verification.

## Source

- Repository: https://gitlab.inria.fr/why3/why3
- Commit: `7c59064b4eed9a4059292599f3a657716aa34784`
- Files: 522
- License: lgpl-2.1

## Schema

| Column | Type | Description |
|--------|------|-------------|
| statement | string | Declaration signature/claim with the leading keyword removed (verbatim slice); the full declaration minus its proof |
| proof | string | Verbatim proof/body, empty if the declaration has none |
| type | string | Declaration keyword |
| symbolic_name | string | Declaration identifier |
| library | string | Sub-library |
| filename | string | Repository-relative source path |
| imports | list[string] | File-level `Require`/`Import` modules |
| deps | list[string] | Intra-corpus identifiers referenced |
| docstring | string | Preceding documentation comment, empty if absent |
| source_url | string | Upstream repository |
| commit | string | Upstream commit extracted |

## Statistics

- Entries: 9,558
- With proof: 4,842 (50.7%)
- With docstring: 1,642 (17.2%)
- Libraries: 21

### By type

| Type | Count |
|---|---|
| let | 1,576 |
| lemma | 1,437 |
| predicate | 933 |
| axiom | 894 |
| function | 881 |
| val | 753 |
| goal | 687 |
| let lemma | 662 |
| type | 560 |
| constant | 336 |
| let function | 300 |
| val function | 179 |
| let constant | 84 |
| val constant | 78 |
| let predicate | 62 |
| inductive | 56 |
| exception | 44 |
| val predicate | 36 |

## Example

```
array [@extraction:array] 'a
= private {
    mutable ghost elts : int -> 'a;
                length : int
  } invariant { 0 <= length }
```

- type: type | symbolic_name: `array` | stdlib/array.mlw

## Use

Each declaration is split into a `statement` (signature/claim) and a `proof` (body) that are disjoint
and together form the complete declaration, for proof modeling, autoformalization, retrieval, and
dependency analysis via `deps`.

## Citation

```bibtex
@misc{why3_dataset,
  title  = {Why3},
  author = {Norton, Charles},
  year   = {2026},
  note   = {Extracted from https://gitlab.inria.fr/why3/why3, commit 7c59064b4eed},
  url    = {https://huggingface.co/datasets/phanerozoic/Why3}
}
```