• 1. proof by contradiction: 反证法 | 归谬法
• 2. proof f by contradiction: 归谬法 | 反证法

• 1.The proof by contradiction is one of the most important methods of proving propositions in mathematics.
  如何有效地提高和改进反证法的教学，是摆在中学数学教师面前的一个重要课题。
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• 2.The proof is by contradiction. Suppose each real number could be given its own room.
  这样的论证是自相矛盾的。
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