Simulation
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A simulation is the operation of simulating, using a simulator or however experimenting a fictitious situation that can show practically the eventual real effects of the conditions that are used by the operator in his test.
Turing uses the term "simulation" to refer to what happens when a digital computer runs a state transition table (runs a program) that describes the state transitions, inputs and outputs of a subject descrete-state machine. The computer simulates the subject machine.
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