At 04:36 AM 10/16/98 -0400, Huw Powell wrote: >> > >stands for DX/DT -- the rate of change of position over time, or SPEED. >> > in that case, make mine dxdt2! >isn't it D2XDT2 or DX2/D2T ? boy, you don't that calculus often IRL, do >you? acceleration is the rate of change of speed of time, hence dx/dt**2. take out the non-dmv characters and you have dxdt2. frank