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Stels [109]
3 years ago
6

Say that a variable A in CFG G is necessary if it appears in every derivation of some string w ∈ G. Let NECESSARY CFG = {hG, Ai|

A is a necessary variable in G}.
a. Show that NECESSARY CFG is Turing-recognizable.
b. Show that NECESSARY CFG is undecidable.

Engineering
2 answers:
ale4655 [162]3 years ago
8 0

Answer:

Explanation:

solution

lawyer [7]3 years ago
8 0

Answer:

NECESSARY CFG is Turing-recognizable and  undecidable already shown bellow

Explanation:

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