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2. 5pt Proposition: If C is a context-free language and R is a regular language, thern Cn R is a context-free language. Remark: For a
2. 5pt Proposition: If C is a context-free language and R is a regular language, thern Cn R is a context-free language. Remark: For a proof of the proposition see Problem 2.18(a) in Sipser. Use the proposition to prove that the language A w E (a,b, c na(w) nb(w) = ne(w)) is not a CFL. 2. 5pt Proposition: If C is a context-free language and R is a regular language, thern Cn R is a context-free language. Remark: For a proof of the proposition see Problem 2.18(a) in Sipser. Use the proposition to prove that the language A w E (a,b, c na(w) nb(w) = ne(w)) is not a CFL
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