Theorems are eternal; their proofs are ephemeral.
定理是永恒的;它们的证明是短暂的。
自由不仅仅是随心所欲的机会;也不仅仅是在既定选项之间选择的机会。自由首先是制定可用选择的机会,对它们进行辩论——然后,是选择的机会。
Complexity is not a barrier to understanding, but a challenge to be overcome.
Patience and persistence are the keys to unlocking the mysteries of mathematics.