Proof: table tennis is as big as the earth

Suppose that the shape of table tennis is the same as that of the earth, and they are all solid. Take table tennis as set a, and the earth as set B. according to the one-to-one correspondence, every point in set a can be found corresponding to it in set B. that is to say, there are as many points in table tennis as there are points in the earth, So it's the same. The assumption is completely realizable, so the proposition holds

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