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有理數集可數,這個應該知道.而代數數是有理係數多項式的根.而對於一個n次有理係數多項式來,他的根只有有限多個.而所有n次有理係數多項式與Q^n等勢,所以是可數的.(Q^n指有理數Q的n次笛卡爾積.對應管道是利用多項式系…
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