Question: (a) Show that if a language L is context-free then so are the following languages: L* = ULK = {W... Wk | k 0,

(a) Show that if a language L is context-free then so are the following languages: L* = ULK = {W... Wk | k 0,

(a) Show that if a language L is context-free then so are the following languages: L* = ULK = {W... Wk | k 0, w; L for all i = 1,...,k}, k20 {wR|WEL}. LR = (Here w denotes the reversal of string w, i.e. w written backwards. (b) Show that if languages L and L are semidecidable, then so are the languages L L and L L2= {wW | W E L, W L}.

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