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An epsilon transition in a nondeterministic automaton

  • A.consumes exactly one character from the input stream
  • B.returns the automaton to its start state immediately
  • C.signals that the input has been accepted by the automaton
  • D.changes state without consuming any input character

Answer: D

Correct answer: changes state without consuming any input character

An epsilon transition is a move the automaton may make for free, without reading anything. It is what makes Thompson’s construction so simple, since the pieces for union and closure can be joined without worrying about which character causes the join. The subset construction removes them again by working with epsilon closures.

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