Using the spin density fluid tensor, we studied torsion, bitorsion for spin module function �� and the proper density of the fluid �. It is shown that if spin and rotation are constant along velocity vector u a then it is geodesic path. Also Rheotetrad used for central quadratic hyper surface. Rheotetrad (u a,P a,Q a,R a) with signature (+,-,-,-) and Relativistic Serret Frenet formula are (Gursey F, 1957) u ‟
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