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A common approach in solving problems is to transform them to different problems, solve the new ones, and derive the solutions for the original problems from those for the new ones. This approach is helpful when the new problems are simpler to solve, or when they usually have known algorithms for solving them. A similar approach is also very useful in the classification of problems according to their complexity.
We'll close our consideration of regular languages by looking at whether (certain) problems about regular languages are algorithmically decidable.
Find the Regular Grammar for the following Regular Expression: a(a+b)*(ab*+ba*)b.
s->0A0|1B1|BB A->C B->S|A C->S|null find useless symbol?
Prove that Language is non regular TRailing count={aa ba aaaa abaa baaa bbaa aaaaaa aabaaa abaaaa..... 1) Pumping Lemma 2)Myhill nerode
To see this, note that if there are any cycles in the Myhill graph of A then L(A) will be infinite, since any such cycle can be repeated arbitrarily many times. Conversely, if the
proof of arden''s theoram
Let G be a graph with n > 2 vertices with (n2 - 3n + 4)/2 edges. Prove that G is connected.
Construct a Mealy machine that can output EVEN or ODD According to the total no. of 1''s encountered is even or odd.
Suppose A = (Q,Σ, T, q 0 , F) is a DFA and that Q = {q 0 , q 1 , . . . , q n-1 } includes n states. Thinking of the automaton in terms of its transition graph, a string x is recogn
S-->AAA|B A-->aA|B B-->epsilon
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