My name is Zhenghua Lyu.  My usual ID on the Internet is kainwen (It does not matter how you pronounce it).

I am a programmer at Pivotal and on 2020.04.07 my company became VMware. I am a developer of Greenplum Database since 2017.07.

Actually Gauss is often called the greatest mathematician of all time. So it’s nice to be able to understand at least one of his discoveries.

Above is a margin comment in the book Concrete Mathematics. I find it useful for me: I would be very happy if I could understand or learn a little more from Masters, such as Donald Knuth, Dan Friedman…