Update README.md

weizx208 · Sep 30, 2021 · 3f4b96d · 3f4b96d
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@@ -28,6 +28,7 @@ mir2x is a c/s based mir2ei implementation with various platforms supported. It
   - mapeditor
 
 YouTube links: [1](https://youtu.be/3Xne8UHlOl0) [2](https://youtu.be/jl1LPxe2EAA)
+Numerical system: [1](https://github.com/etorth/mir2x/raw/master/readme/numerical.pdf)
 
 
 <img src="https://github.com/etorth/mir2x/raw/master/readme/screencapture6.gif" width="800" height="600"/>