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並前往 https://math.libretexts.org/Bookshelves/Mathematical_Logic_and_Proof/Book%3A_Mathematical_Reasoning__Writing_and_Proof_(Sundstrom)/01%3A_Introduction_to_Writing_Proofs_in_Mathematics/1.01%3A_Statements_and_Conditional_Statements
是否確定要離開?
確定! 回上一頁