Let and be statements. Which of the following strategies is not a valid way to show that " implies " ?
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JNU SSS 2010 Question 69: Logic and proof techniques
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Let X and Y be statements. Which of the following strategies is not a valid way to show that " X implies Y "? (A) Show that some statements Z implies Y, and then show that X implies Z (B) Show that either X is false, or Y is true, or both (C) Assume that X is false, and Y is true, and deduce a contradiction (D) Assume that X is true, and Y is false, and deduce a contradiction
Logic and proof techniques has come up 73 times in 3 exams since 2004.
What this question tests
This question is on Proof techniques, part of Logic and proof techniques in Mathematics.
The standard ways to prove or disprove a claim.
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