Abstract
By now, You are familiar with regular expressions, regular grammars, deterministic finite automata, and nondeterministic finite automata. Are they talking about the same class of languages? The examples in the last chapter, at least, suggest that they might. In this chapter, we will see that it is indeed so. We will say, informally, that two mechanisms are equivalent if they accept the same class of languages. In fact, we solve many subproblems to arrive at these equivalences. Our route is from NFA to DFA, from DFA to regular grammar, from regular grammar to NFA, from regular expression to NFA, and finally, from NFA to regular expression.
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