# Page Not Found

The URL `gai-shuai-lun/expectation_variance` does not exist.

You might be looking for one of these pages:
- [expectation_variance](https://windmising.gitbook.io/mathematics-basic-for-ml/src/probability/expectation_variance.md)
- [Divergence](https://windmising.gitbook.io/mathematics-basic-for-ml/src/information/divergence.md)
- [Rotation matrix 旋转矩阵](https://windmising.gitbook.io/mathematics-basic-for-ml/src/geometry/rotationmatrix.md)
- [Information](https://windmising.gitbook.io/mathematics-basic-for-ml/src/information.md)
- [距离](https://windmising.gitbook.io/mathematics-basic-for-ml/src/mathematics/distance.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://windmising.gitbook.io/mathematics-basic-for-ml/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://windmising.gitbook.io/mathematics-basic-for-ml/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/mathematics-basic-for-ml/src/probability/expectation_variance.md`)
- Use `Accept: text/markdown` header for content negotiation