這有個很漂亮的證法, 運用質數的性質就不需要再實際造出函數了。Let be which is a injective function mapping to . Hence there is a bijective function where is infinite. So that, is countable.

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這有個很漂亮的證法, 運用質數的性質就不需要再實際造出函數了。Let be which is a injective function mapping to . Hence there is a bijective function where is infinite. So that, is countable.

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