https://123dok.net/document/q2no35nr-theproceduredemonstratestheconceptofdifferentialclosure-suchthatthedifferentialofanybasisvectorintheframeisa-theconceptofavectorspacerequiresthattheinversematrixofbasisfunctionsexists-anditfollowsthatthedifferentialofthebasisframecanbeexplicitlyevaluated-man.html