Proof by transposition or proof by contrapositive

來源: 布衣之才於 2011-12-28 18:50:50 [檔案] [博客] [舊帖] [給我悄悄話] 閱讀數 : (0 bytes)

回答: 平麵幾何中的“同一法”，英語怎麽說？由到一道於 2011-12-24 04:41:41

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