The elegance of a mathematical proof often mirrors the efficiency of the algorithm it describes.
数学证明的优雅常常反映了它所描述的算法的效率。
解释:在人活动范围内的水就污浊,在野外无人地方的水就清洁。同为一样的水,都是从天边开源,有的混浊有的清洁,这是它们所处环境使它们这样的。
"We are all so much more than we think we are."
从n对观测值的样本中获得的相关系数的可能误差是sqrt((1-r²)/(n-2))。
A prophet is not without honor except in his own country and in his own house