Let Σ = { a } , and consider the language
L = { a n : n is a prime number } = { a 2 , a 3 , a 5 , a 7 , a 11 , . . . } .
Is L a regular language? Why or why not?
(Hint: L contains a 11 , a 17 , a 23 , a 29 , but not a 77 since 77 is divisible by 11. . . )

Question 7. Let Σ = {a}, and consider the language L = {a^n : n is a prime number} = {a 2 , a3 , a5 , a7 , a11 , . . .}. Is L a regular language? Why or why not? (Hint: L contains a 11 , a 17 , a 23 , a 29, but not a 77 since 77 is divisible by 11. . . )
7. Let Σ = {a}, and consider the language L = {a n : n is a prime number} = {a 2 , a3 , a5 , a7 , a11 , . . .}. Is L a regular language? Why or why not? (Hint: L contains a 11 , a 17 , a 23 , a 29, but not a 77 since 77 is divisible by 11. . . ) 8. Design a Turing machine that calculates the sum of...
Let Σ = {a, b}. Consider the language L over Σ that contains Λ and all words whose length is divisible by 6. Build a transition graph that accepts L.
Question 1. Let Σ = {a, b}, and consider the language L = {w ∈ Σ ∗ : w contains at least one b and an even number of a’s}. Draw a graph representing a DFA (not NFA) that accepts this language. Question 2. Let L be the language given below. L = {a n b 2n : n ≥ 0} = {λ, abb, aabbbb, aaabbbbbb, . . .} Find production rules for a grammar that generates L.
. Let Σ = { a, b } , and consider the language L = { w ∈ Σ ∗ : w contains at least one b and an even number of a’s } . Draw a graph representing a DFA (not NFA) that accepts this language.
Question 5. Let Σ = {a, b}, and consider the language L = {a^n : n is even} ∪ {b^n : n is odd}. Draw a graph representing a DFA (not NFA) that accepts this language.
Let Σ = {0,1}and define a language L over Σ as L = {0n10n10n : n ≥1} Show that L is not context-free. Remark: Compare this with language S1 onpage106,which is context free. Hint: Let p be the pumping constant and consider the string s = 0p10p10p. Write s as in the Pumping Lemma. Either vy has no zeros,or it has at leas tone zero;consider theses cases separately.
Question 1. Let Σ = {a, b}, and consider the language L = {w ∈ Σ ∗ : w contains at least one b and an even number of a’s}. Draw a graph representing a DFA (not NFA) that accepts this language.
Let Σ = { a, b } , and consider the language L = { a n : n is even } ∪ { b n : n is odd } . Draw a graph representing a DFA (not NFA) that accepts this language.
Question 5. Let Σ = {a, b}, and consider the language L = {a n : n is even} ∪ {b n : n is odd}. Draw a graph representing a DFA (not NFA) that accepts this language. Question 6. Give a brief description of the language generated by the following production rules. S → abc S → aXbc Xb → bX Xc → Ybcc bY → Yb aY → aa aY → aaX