Simulation
From CTMU Wiki
The following is an excerpt from page 4 of "Reality Self-Simulation Principle; Reality is a Self-Simulation".
A simulation, being defined as the imitation or imaging of a situation or process, is an input-to-output transformation that converts the situation or process to a more or less faithful image thereof. In other words, a simulation is a kind of mapping, which we can write as
Sim: input→output
where “Sim” stands for a simulative mapping operator or a natural or artificial processor which operates as programmed on input from some combination of internal and external sources. The output, consisting of images of the input data under the mapping, “simulates” the input to the extent that it resembles the input or shares its properties. (At this stage of simplification, the observers and programmers for whom the input is “simulated”, and by whom the resemblance will be judged, are implicit.)