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Theorem 5.2 in the textbook says that the language ETM is undecidable. Use the undecidability of ETM to prove that the following language L is
Theorem 5.2 in the textbook says that the language ETM is undecidable. Use the undecidability of ETM to prove that the following language L is unde- cidable:
L = {M1, M2 | M1 and M2 are TMs such that L(M1) L(M2)}.
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