An Explanation of Time
I actually first wrote this 2017-11-11 $ \def\Vec#1{\mathbf{#1}} \def\vt#1{\Vec{v}_{#1}(t)} \def\v#1{\Vec{v}_{#1}} \def\vx#1{\Vec{x}_{#1}} \def\av{\bar{\Vec{v}}} \def\vdel{\Vec{\Delta}} $ Watching a Movie Movies are comprised of a sequence of pictures. Showing pictures in quick succession creates the impression of a continuous sequence of events taking place. Slow motion reduces the frequency of pictures. Down to a certain limit motion still looks smooth, but then we start noticing that there are individual pictures shown. Yet for the following argument this is not important. The point is that we can slow down the frame rate ever more, even down to zero. At this point a last picture is shown, frozen on the screen. The next picture of course still exists, but will not be shown. What is the time coordinate in the film. It is discrete and given by the sequence numbers of