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automata-9 - Automata Chapter 9 Turing Machines Chapter 9...

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Automata Chapter 9. Turing Machines
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Chapter 9. Turing Machines There are some L: not context-free, such as {a n b n c n } and {ww}. New language families? Different type of storages? The most powerful of automata and the limits of computation? Turing machine
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9.1 The Standard Turing Machine Definition 9.1 A Turing machine M is defined by M = (Q, , Γ , δ , q 0 , , F), where Q: the set of internal states, : the input alphabet, Γ : a finite set of symbols, the tape alphabet ( Γ -{ } ), δ : Q X Γ Q X Γ X {L, R} Γ is a special symbol called the blank , q 0 Q is the initial state, F Q is the set of final states. Control unit Read-write head Tape
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9.1 The Standard Turing Machine Ex 9.1 δ (q 0 , a) = (q 1 , d, R) Control (q 0 ) Read-write head Tape a b c Control (q 1 ) Read-write head Tape d b c
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9.1 The Standard Turing Machine Ex 9.2 the Turing machine by Q = {q 0 , q 1 }, = {a, b}, Γ = {a, b, }, F = {q}, δ (q 0 , a) = (q 0 , b, R), δ (q 0 , b) = (q 0 , b, R), δ (q 0 , ) = (q 1 , , L). Control (q 0 ) Read-write head Tape a a
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9.1 The Standard Turing Machine Ex 9.3 Q, , Γ
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