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  1. Sep 2020
    1. In particular, if ∂T∂qj∂T∂qj \dfrac{\partial T}{\partial q_{j}}, then ∂V∂qj∂V∂qj \dfrac{\partial V}{\partial q_{j}} is constant.

      if what? it seems that there is no criteria for the statement. is this a mistake or am I not getting something?