Decius comments on Physicists To Test If Universe Is A Computer Simulation (link) - Less Wrong Discussion
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Surely one can simply manipulate the four-(or eleven)-dimensional equations directly, rather than trying to make a measurement of a continuous object with a tool that only measures discrete states?
If you do that, it's analytical physics, not simulation. Unless you're just collapsing the wavefunction when you notice large entanglements, or something.
It's the difference between plotting a countably infinite number of points and drawing a line.