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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 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. • Point out that because the false conclusion leads to an incorrect statement, the original conclusion must be true.
Joke Time • What did the cloud say to the banker? • “I need a rain check.”
What did the cloud have under its raincoat? • Thunderwear