Add dataset card

README.md

@@ -1,29 +1,68 @@
 ---
-dataset_info:
-  features:
-  - name: fact
-    dtype: string
-  - name: type
-    dtype: string
-  - name: library
-    dtype: string
-  - name: imports
-    list: string
-  - name: filename
-    dtype: string
-  - name: symbolic_name
-    dtype: string
-  - name: docstring
-    dtype: string
-  splits:
-  - name: train
-    num_bytes: 20232821
-    num_examples: 40600
-  download_size: 3888225
-  dataset_size: 20232821
-configs:
-- config_name: default
-  data_files:
-  - split: train
-    path: data/train-*
+license: apache-2.0
+task_categories:
+  - text-generation
+  - feature-extraction
+language:
+  - en
+tags:
+  - theorem-proving
+  - formal-methods
+  - lean4
+  - standard-library
+size_categories:
+  - 10K<n<100K
 ---
+
+# Lean4-Stdlib
+
+Structured dataset of definitions and theorems from the Lean 4 standard library (Init + Std).
+
+## Dataset Description
+
+- **Source:** [leanprover/lean4](https://github.com/leanprover/lean4) (src/Init + src/Std)
+- **Entries:** 40,600
+- **Files processed:** 900 (507 Init + 393 Std)
+- **License:** Apache 2.0
+
+## Schema
+
+| Column | Type | Description |
+|--------|------|-------------|
+| fact | string | Declaration body (without type keyword) |
+| type | string | theorem, def, class, structure, instance, inductive, abbrev, axiom, opaque |
+| library | string | Init.* or Std.* module |
+| imports | list | Import statements |
+| filename | string | Source file path |
+| symbolic_name | string | Declaration identifier |
+| docstring | string | Documentation comment (16% coverage) |
+
+## Statistics
+
+### By Type
+| Type | Count |
+|------|-------|
+| theorem | 31,887 |
+| def | 6,600 |
+| instance | 426 |
+| abbrev | 425 |
+| opaque | 399 |
+| structure | 382 |
+| class | 302 |
+| inductive | 163 |
+| axiom | 16 |
+
+### Docstring Coverage
+- 6,651 entries with docstrings (16%)
+
+## Use Cases
+
+- Retrieval/RAG for Lean 4
+- Learning core Lean 4 patterns
+- Training embeddings for formal proofs
+- API exploration
+
+## Related Datasets
+
+- [Lean4-Mathlib](https://huggingface.co/datasets/phanerozoic/Lean4-Mathlib)
+- [Lean4-Changelog](https://huggingface.co/datasets/phanerozoic/Lean4-Changelog)