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Definition of Frenet frame. Vector t (the transversal or tangent vector) points from a given polymer-chain bead to the next bead. Vector n (the normal vector) is perpendicular to t and lies in the plane of the preceding, current, and next polymer-chain bead, pointing towards the preceding bead. Vector b (the binormal vector) forms the right-handed coordinate system with the transversal vector and the normal vector.
