Report copyright - THE MOVING TRIHEDRON*...(B2£Ai2 - BiT,AiA2), (C^Ai2 -CiY,AiA2). dY d2Z d2Y dZ _ / ds \8 dii dii2 dii2 dii \dsi) where P, Q, R are defined by (18) P = BiC2 - B2Ci, Q = G42 - C2AU R
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