{《四维旅行》[英]R·L·普瓦德万 湖南科学技术出版社 }

运动的静态描述:一个物体在一段时间里处于运动,当且仅当这个物体在这段时间里的每一个瞬间都占据了不同的位置;他在一个瞬间是运动的,当且仅当它在这个瞬间前或后的那个时刻占据了一个不同的位置。P167

可以论证的是时间的流逝正是使时间成为时间的东西:时间的流逝是时间不可或缺的东西。但如果这是对的,我们通常的关于时间的观念就会走向麻烦。P136

离散空间的概念和基本的数学事实相矛盾,因而是不可能的吗?一点也不。毕达哥拉斯定理只有在欧氏几何中才是对的。所以,我们只能说,如果空间是离散的,那么它就不是欧式的。P128

所以,离散的空间和时间的第一个推论是变化本身以跳跃的方式进行,也就是说它将从一个状态跃变到下一个状态,而不经过任何中间状态,因为就没有中间状态。P127

“A psychologist makes an experiment with a mathematician and a physicist. He puts a good-looking, naked woman in a bed in one corner of the room and the mathematician on a chair in another one, and tells him: ‘I´ll half the distance between you and the woman every five minutes, and you´re not allowed to stand up.’ the mathematician runs away, yelling: ‘in that case, I´ll never get to this woman!’. After that, the psychologist takes the physicist and tells him the plan. The physicist starts grinning. the psychologist asks him: ‘but you´ll never get to this woman?’, the physicists tells him: ‘sure, but for all practical things this is a good approximation.’ “

So the minimum scale must exist. Otherwise we will never kiss with our girls.