# Page Not Found

The URL `files/iMZACNAeuMOkZIG1siqr` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [内外积](https://control.xym.work/1_basic_math/1_linear_algebra/3-nei-wai-ji.md)
- [线面积分、外微分、场论初步](https://control.xym.work/1_basic_math/2_calculus/6-xian-mian-ji-fen-yu-wai-wei-fen.md)
- [状态空间描述方法](https://control.xym.work/2_control/2_mimo/1-zhuang-tai-kong-jian-ji-chu.md)
- [抽象向量空间](https://control.xym.work/1_basic_math/1_linear_algebra/7-chou-xiang-kong-jian.md)
- [[数值分析](./3_advanced_math/3_numerical analysis/README.md)](https://control.xym.work/3_advanced_math/shu-zhi-fen-xi-.3advancedmath3numerical-analysisreadme-md.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://control.xym.work/1_basic_math/1_linear_algebra/3-nei-wai-ji.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://control.xym.work/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://control.xym.work/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/1_basic_math/1_linear_algebra/3-nei-wai-ji.md`).

You may also use `Accept: text/markdown` header for content negotiation.
