Question: Language A is mapping reducible to language B , written A < = m B , if there is a computable function f: Sigma ^

Language A is mapping reducible to language B, written A<= m B , if there is a computable function f: Sigma^* longrightarrow Sigma^*, where for every w, w in A iff f(w) in B. The function f is called the reduction from A to B.

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