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假設桌球與地球的形狀完全相同,都是實心的.把桌球看著由無數個掉組成,看作集合A,把地球看作由無數個掉組成,看作集合B,根據一一對應的關係,集合A中的每一點,在集合B中都可以找到相應的點與之對應,也就是說,組成桌球的點和組成地球的點一樣多,所以一樣大.假設的條件是完全可以實現的,故命題成立.
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