The problem of deciding whether two λ-expressions are equivalent is unsolvable.
判断两个λ表达式是否等价的问题是无法解决的。
经济模型的价值在于其解释和预测的能力。
真正的技术是让人感觉不到技术的存在。
Jealous souls will not be answered so; They are not ever jealous for the cause, But jealous for they are jealous: 'tis a monster Begot upon itself,born on itself.