once upon a number 本书的话题之一是数学和幽默都提供大脑的享受，并都可以被认为是处在智力游戏的连续统上。当然，在数学中，强调的是智力，而在幽默中，则是游戏。-One of the topics of this book is to enjoy math and humor of the brain, and can be considered a continuum in the intelligence game. Of course, in mathematics, the