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.
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
Define the term Regular expressions ?
What is the formal definition of DFA ?
Explain how light TP monitors allow distributed applications based on RPC to have transaction properties.
Describe the Strategy of TOC computation box in brief ?
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
How can we characterize DFA languages ?
Give an algorithm that, given a grammar G = (V, Σ, R, S), decides whether the grammar G can derive the empty string.
Define the term computation in TOC ?
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.
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