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Peter Linz Edition 4 Exercise 4.3 Question 7 (Page No. 123)
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Show that the language $L=$ {$a^nb^n:n\geq0$} $\cup$ {$a^nb^{n+1}:n\geq0$} $\cup$ {$a^nb^{n+2}:n\geq0$} is not regular.
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Peter Linz Edition 4 Exercise 4.3 Question 16 (Page No. 123)
Is the following language regular? $L=$ {$w_1cw_2:w_1,w_2∈$ {$a,b$}$^*,w_1\neq w_2$}.
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Peter Linz Edition 4 Exercise 4.3 Question 15 (Page No. 123)
Consider the languages below. For each, make a conjecture whether or not it is regular. Then prove your conjecture. (a) $L=$ {$a^nb^la^k:n+k+l \gt 5$} (b) $L=$ {$a^nb^la^k:n \gt 5,l> 3,k\leq l$} (c) $L=$ {$a^nb^l:n/l$ is an integer} (d) $L=$ ... $L=$ {$a^nb^l:n\geq 100,l\leq 100$} (g) $L=$ {$a^nb^l:|n-l|=2$}
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Peter Linz Edition 4 Exercise 4.3 Question 13 (Page No. 123)
Show that the following language is not regular. $L=$ {$a^nb^k:n>k$} $\cup$ {$a^nb^k:n\neq k-1$}.
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Peter Linz Edition 4 Exercise 4.3 Question 14 (Page No. 123)
Prove or disprove the following statement: If $L_1$ and $L_2$ are non regular languages, then $L_1 ∪ L_2$ is also non regular.
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