Keeping that in mind, consider two common discrete-time FIR (non-recursive) differentiators: a first-difference and a central-difference differentiator.

Time crystals can be classified as either discrete or continuous. An external periodic force drives discrete time crystals, while continuous time crystals emerge from the collective and self-sustained ...

Having argued that it is an open question whether or not space-time is discrete, I then turn to some possible empirical evidence, which we do not yet have. This evidence is based on some slight ...