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:
“Every notable advance in technique or organization has to be paid for, and in most cases the debit is more or less equivalent to the credit. Except of course when it’s more than equivalent, as it has been with universal education, for example, or wireless, or these damned aeroplanes. In which case, of course, your progress is a step backwards and downwards.”
—Aldous Huxley (1894–1963)
“In Hell all the messages you ever left on answering machines will be played back to you.”
—Judy Horacek (b. 1961)
“Generalization, especially risky generalization, is one of the chief methods by which knowledge proceeds... Safe generalizations are usually rather boring. Delete that “usually rather.” Safe generalizations are quite boring.”
—Joseph Epstein (b. 1937)