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06-10-2022
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prove whether each of the following statements about undecidable languages are necessarily true, sometimes true, or never true. if the statement is necessarily true (respectively, never true), provide a proof that that state- ment holds for all (respectively, no) undecidable languages. if the statement is sometimes true, provide languages for which the statement is true and for which the language is false. (a) for an undecidable language l, its complement (l) is undecidable. hint: you may find the contrapositive easier to reason about.

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