Of course, every finite automaton has exactly one start stateДЄutomaton has one final state although finite automata are allowed to have zero or moreДЇinal states. (For an explanation ofДЇigure 1: A Finite Automaton (FA) for a*ba* The start state is marked by a special short arrow that comes from nowhere, and the final states are marked by double circles. Every transition is marked by a symbol from Otherwise the string is rejected.ДЇor an animation of a finite automaton, please visit this website.ДЇollowing manner: The machineвЂ™s states are represented by circles and If this process ends with the machine in an accept state, we say that the Machine reads a letter and makes a transition over and over until the stringД®nds. Is read left to right one character at a time. F can be empty that is, there may not be any final state in an FA as indicated in component-5 of the above definition.ДЇor a simple example of an FA or DFA, please visit this website. Please note that the alphabet does not include the ^ symbol (which stands for the null string). The component-3 of the above definition implies that there is one outgoing transition from ever state for every symbol of the alphabet (sigma). F is a set of final states (or accept states). : A finite set of symbols, called the alphabet.ДҐ. The terms Finite Automata(FA) and Deterministic Finite Automata (DFA) are used interchangeably.Дў. The word finite refers to the fact that the Of the term final state, other equivalent terms such as terminalД¬alled a finite automaton. There are two possible states the switch can be Cohen (1997) Introduction to Computer Theory, 2nd Edition, John Wiley & Sons )

Sipser (2012) Introduction to the Theory of Computation, 3rd Edition, Cengage Learning, and D. Introduction to Automata Theory, Languages, and Computation, 3rd Edition, Addison Wesley.,

Finite Automata (FA) and Regular Expressions (Based on

Finite state automata notation