The λ-calculus is not merely a formalism but a language in which computations can be expressed.
λ演算不仅仅是一种形式主义,而是一种可以表达计算的语言。
程序测试可以用来显示错误的存在,但永远不能显示它们的缺失!
The dialogue between light and shadow creates architecture.
We don't need perfect knowledge to take sensible actions.