--MFra-21-Topaz IIForum|Forum|7 years agoJuly 9, 2018QuestionNo mistake!?!?Forum|Forum|7 years agoJuly 9, 20181 reply1767 viewsHi everyone!, Someone says that this calculation is not correct, for you how is it? 1_time-derivative-of-a-vector.zipStatistics_AnalysisAlgebra_Geometry