Maurice Tutor

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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 17 Jul 2017 My Price 6.00

semi-infinite tape

1. Let M be a Turing machine with one semi-infinite tape and two read/write heads. Each transition of M is determined by the current state p of the finite control, and the two symbols a and b scanned by the two heads. A transition of M is of the form d(p, a, b) = (q, c, d, D1, D2) implying that the finite control goes to state q, the symbol a at the cell pointed by the first head is replaced by c, and the symbol b at the cell pointed by the second head is replaced by d. If both the heads point to the same tape cell (a = b in this case), then the symbol at this cell is replaced by c (not by d unless c = d). Finally, the first head moves by one cell in direction D1 (left or right), and the second head moves by one cell in direction D2. Argue that this two-head Turing machine M can be simulated by a standard Turing machine N with one semi-infinite tape and with only one read/write head.

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Maurice Tutor
(5)
Status NEW Posted 17 Jul 2017 03:07 PM My Price 6.00

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