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Peter Linz Edition 4 Exercise 3.1 Question 23 (Page No. 77)
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For the case of a regular expression $r$ that does not involve $λ$ or $Ø$, give a set of necessary and sufficient conditions that $r$ must satisfy if $L(r)$ is to be infinite.
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Peter Linz Edition 4 Exercise 3.1 Question 26 (Page No. 77)
Find an nfa that accepts the language $L (aa^* (a + b))$.
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Peter Linz Edition 4 Exercise 3.1 Question 24,25 (Page No. 77)
Formal languages can be used to describe a variety of two-dimensional figures. Chain-code languages are defined on the alphabet $Σ =$ {$u, d, r, l$ }, where these symbols stand for unit-length straight lines in ... is a closed contour in the sense that the beginning and ending points are the same? Are these conditions also necessary?
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Peter Linz Edition 4 Exercise 3.1 Question 22 (Page No. 77)
Prove rigorously that the expressions in $r= (1^*011^*)^* (0 + λ) + 1^* (0 + λ)$ do indeed denote the specified language.
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Peter Linz Edition 4 Exercise 3.1 Question 21 (Page No. 77)
Give a general method by which any regular expression $r$ can be changed into $\widehat{r}$ such that $(L(r))^R = L(\widehat{r})$.
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