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army1987 comments on An Intuitive Explanation of Solomonoff Induction - Less Wrong
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As long as our best model of the laws of physics includes the concept of Planck time (Planck length), doesn't that mean that time (space) is discrete and that any interval of time (length of space) can be viewed as an integer number of Planck times (Planck lengths)?
We don't have anything remotely like a well-established theory of quantum gravity yet, so we don't know. Anyway, lack of observable frequency dispersion in photons from GRBs suggests space-time is not discrete at the Planck scale.[http://www.nature.com/nature/journal/v462/n7271/edsumm/e091119-06.html]