Added link to mathematics in programming

README.md

@@ -5,7 +5,7 @@ Edition: $\displaystyle e = \sum \limits _{n=0}^{\infty }{\frac {1}{n!}} = 1 + {
 
 2024/02
 
-This book presents elementary functional algorithms and data structures with 120 exercises and answers. I wrote the first edition from 2009 to 2017, then rewrote from 2020 to 2023. The **second edition** in PDF can be **downloaded** ([EN](https://github.com/liuxinyu95/AlgoXY/files/14003500/algoxy-en.pdf), [中文](https://github.com/liuxinyu95/AlgoXY/files/14003498/algoxy-zh-cn.pdf)). The first edition in Chinese ([中文](https://book.douban.com/subject/26931430/)) was published in 2017.
+This book presents elementary functional algorithms and data structures with 120 exercises and answers. I wrote the first edition from 2009 to 2017, then rewrote from 2020 to 2023. The **second edition** in PDF can be **downloaded** ([EN](https://github.com/liuxinyu95/AlgoXY/files/14003500/algoxy-en.pdf), [中文](https://github.com/liuxinyu95/AlgoXY/files/14003498/algoxy-zh-cn.pdf)). The first edition in Chinese ([中文](https://book.douban.com/subject/26931430/)) was published in 2017. For more about [mathematics in programming](https://link.springer.com/book/10.1007/978-981-97-2432-1).
 
 <img src="https://user-images.githubusercontent.com/332938/95418499-442e4b00-096a-11eb-81b9-496020aa5f10.jpg" width="400">