Let AMBIG CFG = {G| G is an ambiguous CFG}. Show that AMBIGCFG is undecidable. Use a
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Let AMBIGCFG = {〈G〉| G is an ambiguous CFG}. Show that AMBIGCFG is undecidable. Use a reduction from PCP. Given an instance
of the Post Correspondence Problem, construct a CFG G with the rules
where a1, . . . , ak are new terminal symbols. Prove that this reduction works.
Transcribed Image Text:
S - T|B T + tịTa1|| B - bị Bai | | tkTak | tia1 | | br Bak | biai | .. | tkak | bkak ,
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