diff --git a/.gitattributes b/.gitattributes
index bed0738c7eeb449bca98b5d2f33c89a1ee56349a..2a70c7743faf8f83488bf0b69ad6719a488f3e9d 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -58,3 +58,67 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 # Video files - compressed
 *.mp4 filter=lfs diff=lfs merge=lfs -text
 *.webm filter=lfs diff=lfs merge=lfs -text
+adv-00000.jsonl filter=lfs diff=lfs merge=lfs -text
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..50ffaf4b58742e616b393cf6b8cea14c7ef6b6b3
--- /dev/null
+++ b/README.md
@@ -0,0 +1,50 @@
+---
+license: mit
+language:
+- ja
+- en
+tags:
+- mathematics
+- synthetic
+- japanese
+- retrieval
+task_categories:
+- question-answering
+pretty_name: LongBook Math 2M (JA basic + advanced)
+size_categories:
+- 1M<n<10M
+---
+
+# LongBook Math 2M (Japanese basic + advanced, unified)
+
+2,000,000 deterministic synthetic Japanese mathematics documents in **one** dataset:
+基礎 100万件 + 高度 100万件。Built for [LongBook](https://github.com/Summer110622/LongBook).
+
+- Format: JSONL, one document per line: `{id, namespace, text, metadata{domain, difficulty, lang, kind, index}}`
+- `math-*.jsonl` (1,000,000): 基礎8分野 (`namespace=math`) — arithmetic / algebra / calculus / linear_algebra / probability / geometry / number_theory / logic_sets
+- `adv-*.jsonl` (1,000,000): 高度8分野 (`namespace=math-advanced`) — analysis / ode / linear_algebra_adv / probability_adv / number_theory_adv / combinatorics_adv / vector_geometry / statistics
+- `text` structure (Japanese): 【分野】/【問題 id】/【解法】/【答え】/【キーワード】/【確認】
+- Answers are **computed in Python by the generators, not hallucinated** (RSA round-trip, CRT congruences, trace/det, Bayes fractions verified).
+- Generators: `dataset/build_math_dataset.py` (`--seed 42`), `dataset/build_advanced_math_dataset.py` (`--seed 123`).
+- Reading guide for sub-agents: `dataset/MATH_SUBAGENT.md` (model-agnostic, default `Qwen/Qwen3.5-9B`).
+
+## Usage (datasets)
+
+```python
+from datasets import load_dataset
+# all 2M
+ds = load_dataset("summerMC/LongBook-math-2M", split="train", data_files="*.jsonl")
+# basic only / advanced only
+basic = load_dataset("summerMC/LongBook-math-2M", split="train", data_files="math-*.jsonl")
+adv = load_dataset("summerMC/LongBook-math-2M", split="train", data_files="adv-*.jsonl")
+```
+
+## Usage (LongBook retrieval)
+
+```bash
+python3 dataset/bulk_ingest_math_dataset.py --input <dir> --namespace math --db ./data/longbook.sqlite3
+# namespace はファイル内の値(math / math-advanced)に合わせて --namespace を指定
+curl http://127.0.0.1:30000/v1/longbook/search \
+  -H 'Content-Type: application/json' \
+  -d '{"query":"固有値 対角化","namespace":"math-advanced","top_k":5}'
+```
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@@ -0,0 +1,18 @@
+{
+  "count": 2000000,
+  "parts": {
+    "basic": {
+      "count": 1000000,
+      "seed": 42,
+      "files": "math-*.jsonl",
+      "namespace": "math"
+    },
+    "advanced": {
+      "count": 1000000,
+      "seed": 123,
+      "files": "adv-*.jsonl",
+      "namespace": "math-advanced"
+    }
+  },
+  "format": "jsonl(id,namespace,text,metadata)"
+}
\ No newline at end of file
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