Question: 1 . ( Sipser , problem 5 . 1 ) Show that EQCF G is undecidable. Hint, use Thm . 5 . 1 3 ,

1.(Sipser, problem 5.1) Show that EQCF G is undecidable. Hint, use Thm.5.13, which states that ALLCF G is undecidable.

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