Finite State Machines
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Definition
A finite state machine is a way of breaking down a problem into several mutually independent states that are only able to change when a transition occurs.
Finite State Automaton
A finite state automaton is a finite state machine which has no output. It has a start state and a set of end/accept states. If the automaton can reach an end state then the input is accepted.
Mealy Machines
A finite state machine with an output is called a Mealy Machine. It will output a value based on the input.