# Proofs from the Book - 来自圣经的证明

##### 系列：数学之美

"Good mathematics" could refer (in no particular order) to

...... Elegant mathematics (e.g. Paul Erdos's concept of "proofs from the Book" achieving a difficult result with a minimum of effort);

Terry Tao in What is Good Mathematics

Sylvester-Gallai 定理：平面上不全共线的$n(n>2)$ 个点，必有一条直线恰过其中两个点。

Motzkin-Rabin 定理：平面上不全共线的$n(n>2)$ 个点，每个点红黑二染色后，存在一条直线穿过至少两个点且颜色全部相同。

Q. E. D.