无穷不仅仅是“很多很多 Not necessary It is possible to define comparisons 伽利略悖论： amongst infinite sets in a meaningful way！ 整体与局部“一样大”】 23 4 5 67 8 Galileo Galilei 1625 36 49 64.. The ideas of less,equal,and greater apply to (what we would now call)finite sets,but not to infinite sets https://en.wikipedia.org/wiki/Galileo%27s paradox无穷不仅仅是“很多很多” 伽利略悖论： 整体与局部“ 一样大”！ https://en.wikipedia.org/wiki/Galileo%27s_paradox Galileo Galilei The ideas of less, equal, and greater apply to (what we would now call) finite sets, but not to infinite sets！ Not necessary！ It is possible to define comparisons amongst infinite sets in a meaningful way！