# Page Not Found

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## Suggested Pages

You may be looking for one of the following:
- [A Simple Explanation of Information Gain](https://www.damonyuan.com/math/191014-a-simple-explanation-of-information-gain.md)
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- [Mean and Variance of Squared Gaussian](https://www.damonyuan.com/math/230721-mean-and-variance-of-squared-gaussian.md)
- [Interesting Bitwise Operation](https://www.damonyuan.com/tech/2023/231116-interesting-bitwise.md)
- [The Difference between 127.0.0.1 and 0.0.0.0](https://www.damonyuan.com/tech/2019/191001-difference-between-two-ips.md)

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

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

```
GET https://www.damonyuan.com/math/191014-a-simple-explanation-of-information-gain.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://www.damonyuan.com/sitemap.md

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

### Option 3 — Retrieve the full documentation corpus

Full export: https://www.damonyuan.com/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., `/math/191014-a-simple-explanation-of-information-gain.md`).

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