Formal desrciption of DFA operation
State the Formal desrciption of DFA operation ?
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A deterministic finite automaton
M = (Q, Σ, δ, q0, F) accepts a string w = w1 w2 w3 …wn ε Σ*if ∃ a sequence r0, r1, r2,…, rn of states for which–r0 = q0–δ(ri, wi+1) = ri+1 for i = 0, 1, 2, …, n-1–rn ∈ F
Describe the theorem that a language L is recognized by a DFA if and only if L is illustrated by a regular expression.
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Let α be a regular expression of length n. (a) Using procedures shown in class, if we convert α into a regular expression β such that L(β) = L(α). How long β might be? Give a reasonably tight upper bound.
Let s1 and s2 be two strings of lengths m and n respectively. By definition, a superstring of s1 and s2 is one which contains s1 and s2 as substrings. Give a dynamic programming algorithm to compute a shortest superstring of t
Let REGEXP be the language of valid regular expressions over {a, b}. That is, REGEXP is the set of all strings over the symbols Σ= {a, b, (,), U,*, ^} that are valid regular expressions. For example, the string “a (a U b)" is in REGEXP, whereas the string
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