Finite Automata
What do you understand by the term Finite Automata ?
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Finite automata is a simple model of computation
It reads input from left to right, and one symbol at a time
It maintains state: The information regarding what seen so far (“memory”)
Begin with deterministic finite automata (DFA)
It can be described by two ways that is, by diagram or formally.
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State the Formal desrciption of DFA operation ?
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
Give an algorithm that, given a grammar G = (V, Σ, R, S), decides whether the grammar G can derive the empty string.
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