Quantum theoretical physics is statistical and relativistic. II

The vanishing divergence of 4-velocity, crucial to our theoretical basis for a classical statistical quantum mechanics, is investigated further. We demonstrate that this property of 4-velocity is of purely relativistic—kinematic origin. So, unlike our treatment in the initial work, we need not constrain the environment to that of electromagnetism; a superior argument results by the analog of a relativistic particle's world line with fixed curves in a Euclidean 3-space, such that ·v=0 iff (v)²=–1!