"A good illustration should tell a story on its own, without the need for words."

如果我等待完美，我将永远写不出一个字。

每一个数学问题都是一个等待解决的谜题，每一个解答都是向理解现实结构迈进的一步。

It is India that gave us the ingenious method of expressing all numbers by means of ten symbols, each symbol receiving a value of position as well as an absolute value.