About existence of quasi-double lines of the partial mapping of space En by Matieva, Gulbadan, Abdullayeva, Cholpon, Ahmedov, Anvarjon A.

“…Integral lines of the vector fields are formed net ∑n of Frenet. There is exist the point on the tangent of the line ωi. …”
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Existence of immovability lines of a partial mapping of Euclidean space E5 by Matieva, Gulbadan, Abdullayeva, Cholpon, Ahmedov, Anvarjon A.

“…Integral lines of the vector fields are formed net ∑5 of Frenet. There exists a point on the tangent of the line ∑5. …”
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Frames, the beta-duality in Minkowski space and spin coherent states by Ali, S.T., Gazeau, J.P., Karim, M.R.

“…The sections, in their turn, are determined by particular velocity vector fields, the latter always appearing in dual pairs. …”