For new readers and those who request to be “好友 good friends” ,  please read my 公告栏 first.

I have said this before: If Rip van Winkle woke up  and walk into a university lecture room,he will feel quite at home since teaching methodology have not advanced much in taking advantage of technology in centuries.  Just today, my good friend Karl Astrom of control research fame just send me information about an interactive mathematic book his son co-authored on linear algebra that utilizes more digital technology and Graphic User Interface (GUI) fully  http://immersivemath.com/ila/index.html.

Take a look.