Other Equivalent Machines and Methods
- Multidimensional Turing machine: For example, a model by Schönhage (1980) uses the four head-movement commands { North, South, East, West }.
- Single-tape, multi-head Turing machine: In an undecidability proof of the "problem of tag", Minsky 1961 and Shepherdson and Sturgis (1963) described machines with a single tape that could write along the tape with one head and read further along the tape with another.
- Markov Algorithm (1960) is another remarkably simple computational model, based on string rewriting, equivalent to the Turing machines.
- Lambda calculus
- Queue automaton
Read more about this topic: Turing Machine Equivalents
Famous quotes containing the words equivalent, machines and/or methods:
“I started off rapping for people just like myself, people who were in awe of wealth and flash. It was a conversation between me and them. But now most of those who buy my records are listening in on others’ conversation. They are the aural equivalent of voyeurs, thrilled at this crazy world that has nothing to do with their experience.”
—Ice-T [Tracy Marrow], U.S. rap musician. Observer (London, Oct. 27, 1991)
“In Hell all the messages you ever left on answering machines will be played back to you.”
—Judy Horacek (b. 1961)
“A writer who writes, “I am alone” ... can be considered rather comical. It is comical for a man to recognize his solitude by addressing a reader and by using methods that prevent the individual from being alone. The word alone is just as general as the word bread. To pronounce it is to summon to oneself the presence of everything the word excludes.”
—Maurice Blanchot (b. 1907)