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Formal Definition of a DFA. A DFA can be represented by a 5-tuple (Q, ∑, δ, q 0, F) where −. Q is a finite set of states. ∑ is a finite set of symbols called the alphabet. δ is the transition function where δ: Q × ∑ → Q. q0 is the initial state from where any input is processed (q 0 ∈ Q). F is a set of final state/states of Q (F. 1 Answer to A non-erasing Turing machine is one that cannot change a nonblank symbol to a blank. This can be achieved by the restriction that if then a must be . Show that no generality is lost by making such a restriction.  . pointing to the rst symbol of the output. Remark 1. One reason that these languages are called \recursively enumerable" is that it is possible to \enumerate" all strings in such a language by a special type of Turing machine, enumerator. This Turing.