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Lecture15_Part2 - Introduction 1 We know that A is...

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Using a decider for L to construct a decider for , is called reducing L to . Note: Once we prove that a certain language L Introduction TM A TM A is undecidable, we can prove that some other language, say L’ , is undecidable, by reducing L’ to L . 5 1. We know that A is undecidable. 2. We want to prove B is undecidable. 3. We assume that B is decidable and use this Schematic of a Reduction assumption to prove that A is decidable. 4. We conclude that B is undecidable. Note: The reduction is from A to B . 6 1. We know that A is undecidable.
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