> For the complete documentation index, see [llms.txt](https://docs.fiinquant.vn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fiinquant.vn/fiinquant-en/function-and-formula.md).

# FUNCTION AND FORMULA

- [Real-time data function](https://docs.fiinquant.vn/fiinquant-en/function-and-formula/real-time-data-function.md)
- [Historical data function](https://docs.fiinquant.vn/fiinquant-en/function-and-formula/historical-data-function.md): This section describes how to use the library once the user has logged in. Details are provided at the end of this chapter.
- [Function for connecting real-time and historical data](https://docs.fiinquant.vn/fiinquant-en/function-and-formula/function-for-connecting-real-time-and-historical-data.md)
- [Order book data function](https://docs.fiinquant.vn/fiinquant-en/function-and-formula/order-book-data-function.md)
- [List of technical analysis indicators](https://docs.fiinquant.vn/fiinquant-en/function-and-formula/list-of-technical-analysis-indicators.md)
- [Feature function](https://docs.fiinquant.vn/fiinquant-en/function-and-formula/feature-function.md): Functions specifically developed for FiinQuant allow users to utilize them immediately, without needing to develop the problem themselves.
- [Support data](https://docs.fiinquant.vn/fiinquant-en/function-and-formula/support-data.md)
- [List of stocks by index group](https://docs.fiinquant.vn/fiinquant-en/function-and-formula/support-data/list-of-stocks-by-index-group.md)