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+*.parquet binary
+*.jsonl text eol=lf
+*.md text eol=lf
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README.md

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+---
+license: other
+license_name: sklyanov-textbook-derived
+language:
+- en
+tags:
+- mathematics
+- math
+- algebra
+- trigonometry
+- calculus
+- problem-solving
+- worked-solutions
+- latex
+- textbook
+- english-translation
+pretty_name: Sklyanov Math Problems (English Q&A)
+size_categories:
+- 1K<n<10K
+configs:
+- config_name: full
+  data_files:
+  - split: train
+    path: data/full/train-*.parquet
+  - split: test
+    path: data/full/test-*.parquet
+- config_name: qa
+  data_files:
+  - split: train
+    path: data/qa/train-*.parquet
+  - split: test
+    path: data/qa/test-*.parquet
+dataset_info:
+- config_name: full
+  features:
+  - name: id
+    dtype: string
+  - name: chapter
+    dtype: int64
+  - name: problem_number
+    dtype: int64
+  - name: group
+    dtype: string
+  - name: marker
+    dtype: string
+  - name: question_en
+    dtype: string
+  - name: answer_en
+    dtype: string
+  - name: final_answer_en
+    dtype: string
+  - name: has_question
+    dtype: bool
+  - name: has_answer
+    dtype: bool
+  - name: source_page_problem
+    dtype: int32
+  - name: source_page_solution
+    dtype: int32
+  splits:
+  - name: train
+    num_examples: 3440
+  - name: test
+    num_examples: 180
+- config_name: qa
+  features:
+  - name: id
+    dtype: string
+  - name: chapter
+    dtype: int64
+  - name: group
+    dtype: string
+  - name: question_en
+    dtype: string
+  - name: final_answer_en
+    dtype: string
+  - name: answer_en
+    dtype: string
+  splits:
+  - name: train
+    num_examples: 3156
+  - name: test
+    num_examples: 155
+---
+
+# Sklyanov Math Problems — English Q&A Dataset
+
+**3,620 problems** from M. I. Sklyanov's classic Russian entrance-exam problem book
+*Сборник задач по математике для поступающих в втузы (с решениями). Кн. 1. Алгебра*
+(*A Collection of Problems in Mathematics for Applicants to Higher Education (with Solutions)*,
+Book 1: Algebra). Every problem statement and every printed solution has been transcribed from
+the scanned pages and translated from Russian into English, with all mathematics rendered in
+LaTeX.
+
+## What is in it
+
+- **3,620 problems** across 11 chapters (algebraic expressions, algebraic equations,
+  word problems, trigonometric identities, trigonometric equations, progressions, logarithms,
+  inequalities, combinatorics, extra algebra, beginnings of analysis).
+- **3,311 complete Q&A pairs** — the book prints worked solutions for only some problems,
+  so the remaining rows carry the statement alone (`has_answer: false`).
+- Full worked solutions in `answer_en`; short final results in `final_answer_en`.
+- Difficulty `group` (A/B/C) and the book's own marker glyph (`□`, `■`) are preserved.
+
+## Configs
+
+| Config | Rows | Contents |
+|---|---|---|
+| `full` | 3,620 | Every problem: statement, solution, final answer, source pages |
+| `qa` | 3,311 | Only complete pairs, with a compact schema for QA / RAG / SFT |
+
+Splits are a deterministic 95/5 train/test split, stratified by chapter (seed 42), and a row
+keeps the same split in both configs.
+
+## Load it
+
+```python
+from datasets import load_dataset
+
+full = load_dataset("ORCHORDS/dgn-math-problems", "full")
+print(full["train"][0])
+
+qa = load_dataset("ORCHORDS/dgn-math-problems", "qa")
+```
+
+Or straight from the files:
+
+```python
+from datasets import load_dataset
+ds = load_dataset("parquet", data_files={"train": "data/full/train-*.parquet"})
+```
+
+## Schema (`full` config)
+
+| Column | Type | Description |
+|---|---|---|
+| `id` | string | Printed problem number, e.g. `3.014` |
+| `chapter` | int | Chapter 1–11 |
+| `problem_number` | int | Position within the chapter |
+| `group` | string | Difficulty group as printed: `A`, `B`, `C` or `""` |
+| `marker` | string | Difficulty marker glyph: `□`, `■` |
+| `question_en` | string | English problem statement, mathematics in LaTeX |
+| `answer_en` | string | English worked solution / answer as printed |
+| `final_answer_en` | string | Short final result (may be empty) |
+| `has_question` | bool | Whether a statement was found |
+| `has_answer` | bool | Whether a solution was found |
+| `source_page_problem` | int | PDF page of the statement |
+| `source_page_solution` | int | PDF page of the solution |
+
+The `qa` config has: `id`, `chapter`, `group`, `question_en`, `final_answer_en`, `answer_en`.
+
+## Sample
+
+```json
+{
+  "id": "3.001",
+  "question_en": "Of four given numbers, the first three are to one another as $1/5:1/3:1/20$, and the fourth is $15\\%$ of the second number. Find these numbers if the second number is $8$ greater than the sum of the remaining numbers.",
+  "answer_en": "The required numbers are $k/5$; $k/3$; $k/20$; $0.15\\cdot k/3=k/20$. By the condition, $\\frac{k}{3}-8=\\frac{k}{5}+\\frac{k}{20}+\\frac{k}{20}$, whence $k=240$.",
+  "final_answer_en": "$48;\\ 80;\\ 12;\\ 12$"
+}
+```
+
+## License & rights
+
+This dataset is a derived work: every row is an English translation and LaTeX transcription of
+problems and solutions from M. I. Sklyanov's textbook *Сборник задач по математике для поступающих
+в втузы (с решениями). Кн. 1. Алгебра*. Copyright in the original text, problems and solutions
+belongs to its publisher and author. This repository is published for educational and research use;
+please check the rights in the original edition before redistributing it commercially.
+
+## Provenance & method
+
+The source PDF is a 527-page image-only scan with no text layer. All pages were rasterised at
+300 dpi and transcribed with a vision language model (MiniMax-M3) into structured JSON with
+LaTeX mathematics and English prose; 527/527 pages succeeded. A repair pass recovered pages
+whose JSON contained unescaped LaTeX backslashes. Problem ids were cross-checked against an
+independent Tesseract OCR pass (a strict subset, no missed ids) and every chapter's id range is
+contiguous, e.g. `1.001`–`1.360`, `4.001`–`4.500`, `11.001`–`11.275`.
+
+Russian notation was normalised on the way out (`\operatorname{tg}` → `\tan`,
+`\operatorname{ctg}` → `\cot`).
+
+## Known caveats
+
+- Mathematics comes from a vision transcription of a scan, not from a text layer, so isolated
+  symbols may occasionally differ from the print.
+- `final_answer_en` is empty for some rows where the book states the result only inside the
+  worked solution — use `answer_en` there.
+- Solutions that continue over a page break are concatenated into one entry.
+- Rows whose solutions the book never prints are marked `has_answer: false` rather than dropped.

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