Theory of computation | Models of computation

X-machine

The X-machine (XM) is a theoretical model of computation introduced by Samuel Eilenberg in 1974.The X in "X-machine" represents the fundamental data type on which the machine operates; for example, a machine that operates on databases (objects of type database) would be a database-machine. The X-machine model is structurally the same as the finite-state machine, except that the symbols used to label the machine's transitions denote relations of type X→X. Crossing a transition is equivalent to applying the relation that labels it (computing a set of changes to the data type X), and traversing a path in the machine corresponds to applying all the associated relations, one after the other. (Wikipedia).

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Related pages

Finite-state machine | Formal specification | SXM (computational model) | Samuel Eilenberg | Communicating X-Machine | Computation | X-Machine Testing | Turing machine | Relation (mathematics) | Hypercomputation | Stream X-Machine