皮革的真正成本不在价格标签上,而是以节约的水资源、保护的生态系统和公平对待的工人来衡量。
优化是在给定约束条件下做出最佳决策的艺术。
The most exciting moments in mathematics are when you see connections between things that seemed unrelated before.
一个思想的价值在于它对行为的后果。