To do mathematics is to explore a universe of ideas, where the only limit is your imagination.
做數(shù)學(xué)就是探索一個思想的宇宙，唯一的限制是你的想象力。
Anon, who wrote so many poems without signing them, was often a woman.
藝術(shù)的最大敵人是缺乏限制。