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。
        I don’t like to do easy things. I like to challenge myself.
                    我不是音乐产业的产物,音乐产业是我的产物。
                    当机会来临时,你必须抓住它。
                    The concept of a multiverse arises naturally from the inflationary model of the universe.
                    I was born to be a star, I don't do regular.