Question: When L is a language, lengths(L) denotes the language {1|w|: w L}1?. (2) Context-free languages: (a) Let ALLLENPDA = {M : M is an PDA

When L is a language, lengths(L) denotes the language {1|w|: w L}1?.

(2) Context-free languages: (a) Let ALLLENPDA = {M : M is an PDA for which lengths(L(M )) = 1?}. Prove or disprove: ALLLENPDA is decidable. (b) Let REGLENPDA = {M : M is an PDA for which lengths(L(M )) is regular}. Prove or disprove: REGLENPDA is decidable.

When L is a language, lengths(L) denotes the language {1|w|: w L}1?. (2) Context-free languages: (a) Let ALLLENPDA = {M : M is an

When L is a language, lengths(L) denotes the language {1lvl : WEL}

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