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Peter Linz Edition 4 Exercise 2.3 Question 6 (Page No. 62)
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Is it true that for every nfa $M = (Q,Σ,δ,q_0,F)$ the complement of $L(M)$ is equal to the set
{$w ∈ Σ^*: δ^*(q_0,w) $ $\cap$ $(Q-F)$ $\neq$ $Ø$}? If so, prove it. If not, give a counterexample.
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Peter Linz Edition 4 Exercise 2.3 Question 14 (Page No. 62)
Let $L$ be any language. Define $even (w)$ as the string obtained by extracting from $w$ the letters in even-numbered positions; that is, if $w = a_1a_2a_3a_4…$, then $even (w)= a_2a_4.…$ Corresponding to this, we can define a language $even (L) =$ {$even (w): w ∈ L$}. Prove that if $L$ is regular, so is $even(L)$.
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Peter Linz Edition 4 Exercise 2.3 Question 13 (Page No. 62)
Give a simple verbal description of the language accepted by the dfa in following figure. Use this to find another dfa, equivalent to the given one, but with fewer states.
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Peter Linz Edition 4 Exercise 2.3 Question 12 (Page No. 62)
Show that if $L$ is regular, so is $L^R$.
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Peter Linz Edition 4 Exercise 2.3 Question 11 (Page No. 62)
Prove that all finite languages are regular.
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