Math in Chinese

I had to find the math department on my own today. With the help of an American I found, I found the building. But the building is quite large and has many departments.

As I was looking around for the school of math, I realized to my embarrassment that I do not know the first character for the word "math" in Chinese (su xue). When I saw the character, I could see why it is hard to remember but I still should know it.

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