I don't think acceleration is a torsor, quite, but if you understand a torsor, you understand how acceleration can be absolute even if velocity is not: http://m

I don't think acceleration is a torsor, quite, but if you understand a torsor, you understand how acceleration can be absolute even if velocity is not: http://math.ucr.edu/home/baez/torsors.html http://math.ucr.edu/home/baez/torsors.html