sistemes no inercials

d_{t}[x] = d_{t}[y]+(-1)·R·d_{t}[s(t)]


d_{tt}^{2}[x] = d_{tt}^{2}[y]+(-1)·R·d_{tt}^{2}[s(t)]


d_{tt}^{2}[x] = d_{tt}^{2}[y]+(-1)·( R/s(t) )·d_{t}[s(t)]^{2}


d_{t}[x] = d_{t}[y]+(-1)·R·ln(s(t)) [o(t)o] s(t)