1. Consider the regular grammar G given below: S → aS|aA|bB|λ A → aA|bS B →...

1. Consider the regular grammar G given below:

S → aS|aA|bB|λ

A → aA|bS

B → bB|aS

(a) Give a derivation for the strings aabbba and baaba

(b) Give an infinite language L such that L is not a subset of L(G)

(c) Give a regular expression that describes the language L(G).

Expert Solution

(a)

aabbba

S -> (aS) -> a(aS) -> aa(bB) -> aab(bB) -> aabb(bB) -> aabbb(aS) -> aabbba() -> aabbba

baaba

S -> (bB) -> b(aS) -> ba(aS) -> baa(bB) -> baab(aS -> baaba( ) -> baaba

(c) please refer to the image below. We are constructing an NFA from the given relations. We add a starting state q and ending state f . Then we remove each intermidiary state and replacing the edges with their regular expressions until we have only q and f remaining in the NFA to get our regular expression

For part (b) we simply use our regular expression from (c) to construct a language which includes more than what our L(G) defines by including some extra language rules. All has been given in the pictures above

venereology answered 1 year ago

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