关于无限集，可能好多听众也了解过一些，比如你可能听过这个比喻，就是如果一个旅馆有无穷多个房间，而且住满了，那么又来了一个旅客，怎么让他入住呢。如果是有限个房间的旅馆，那当然是没办法了，但是有无穷多个房间的旅馆的话，没有问题，老板胸有成竹，他一声令下，请所有住客注意，如果你现在是第n号房间，请你搬到第n+1号房间。然后新来的旅客就顺利入住了第1号房间。然后忽然又来了无穷多个旅客了，怎么办呢。老板还是不慌不忙，发了一道新指令，请所有第n号房间的住客搬到第2n号房间，然后瞬间就发现所有奇数号房间都腾出来了，新来的无穷多个旅客就顺利入住了。 无限集世界很奇妙，连续统假设更烧脑。p与t的定义：
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