1. v=∇S/m is still discrete? i mean the motion of particle still quanta or continuous? 2. so v is the velocity of the particle(group) or wave(phase velocity)? 3. ∇S can be find by measure the velocity of wave or particle? 4. So the wave is not longer associated with particle (wave particle duality)but guide the particle in the space? 5. the idea contradict his original matter wave theory?