Mathematics knows no races or geographic boundaries; for mathematics, the cultural world is one country.
Make it simple. Make it memorable. Make it inviting to look at. Make it fun to read.
语出西汉·桓宽《盐铁论·申韩》。国家不愁没有法制,而是怕没有切实可行的法制。说明制定法律应能够施行。
未知不是要害怕的东西,而是要拥抱的东西。