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In computability and complexity, finding mappings between problems that allow solving one problem using a solution of another one. For reduction in programming language theory (e.g. beta-reduction), see [lambda-calculus] or [term-rewriting].

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Reduction and decidability

Wrong solution ( based on the comment below ) L={⟨M⟩ | M accepts w whenever it accepts $w^R$}. Proof by contradiction. Assume that L is decidable and let $R$ be a decider for it. We will const …
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