Question: Show that EMPTY = {M : L(M) is empty} is co-r.e.-complete: EMPTY is co-r.e., and every co-r.e. language L reduces to EMPTY.

Show that EMPTY = {M : L(M) is empty} is co-r.e.-complete: EMPTY is co-r.e., and every co-r.e. language L reduces to EMPTY.

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