我已经履行了我的职责。我证明了庞加莱猜想,我在数学上没有什么可做的了。
I have already carried out my duty. I have proved the Poincaré conjecture and I have nothing more to do in mathematics.
写作就是呼吸,而呼吸就是生活。
礼貌,并不需要花钱。用完马桶后,把马桶盖放下;上电梯时,耐心等别人出来再进去;把购物车放回指定区域;在借东西时,归还时要东西的状态要比你借的时候还要好(例如给车加满油、把物品清理干净)。
天地有万古岁月,可人死了就不会再复活;人寿命最多百年,一天很容易就会过去了。
The historian must have a kind of faith that humanity will not and cannot perish.
Legal systems are not static; they evolve over time.