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假設一個有限多個,設為X,證明事實上存在多過X個的有理數. 囙此假設命題是錯誤的,根據反命題原理,假設命題的反命題“…存在無限多個有理數…”是正確的.
e是無理數,ln2也是無理數,但是e^(ln2)=2是有理數.
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