http://s16/middle/642f13c7g9bbd993b7cdf&690

以上照片来自美国数学协会的网站。http://maa.org/FoundMath/11week06.html

在普通人眼中的雪，在沉迷数学的学生看来就是一个公式。

MAA Found Math: (Amherst College, Class of 2013) snapped this photo in front of College Hall during last week's epic snowstorm. The photo was selected as Amherst's "Picture of the Day" with the title "y = -x^2".