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Indirect Proof

Indirect Proof. Section 5-3. Steps for Writing an Indirect Proof. Assume the conclusion is false. Show that this assumption leads to a contradiction of the hypothesis, or some other fact, such as a definition, postulate, theorem, or corollary.

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Indirect Proof

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  1. Indirect Proof Section 5-3

  2. Steps for Writing an Indirect Proof • Assume the conclusion is false. • Show that this assumption leads to a contradiction of the hypothesis, or some other fact, such as a definition, postulate, theorem, or corollary. • Point out that because the false conclusion leads to an incorrect statement, the original conclusion must be true.

  3. Joke Time • What did the cloud say to the banker? • “I need a rain check.”

  4. What did the cloud have under its raincoat? • Thunderwear

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