Extensions and Restrictions of Turing Machines

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Extensions and Restrictions of Turing Machines

Extensions: (see this link too) Many extensions of Turing machines are no more powerful than the originals This is evidence that Turing machines are a universal model of computation Extensions: (see this link too) Multiple tapes Multiple read write heads Random access Nondeterminism Two or more dimensions

Restricted versions of Turing Machines Infinite versus semi-infinite tape Restricted versions of Turing Machines Only move to the right Only one state Never change a tape symbol All these restrictions make Turing machines weaker