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Five Families of Ruled Surfaces Through a Line of a Rectilinear Congruence, III
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Five families of ruled surfaces through a line of a rectilinear congruence obtained by the repeated application of the operation of forming the Jacobian from Sannia's quadratic forms f ≡ Gaβ dua duβ and φ ≡ε aβ dua duβ were studied in detail by Ogura [7, 8], Hayashi [2], Ram Behari [9] and Mishra [4]; and those from Kummer's quadratic forms f ≡ Gaβ dua duβ and θ ≡ μaβ dua duβ by Mishra [5]. It is the purpose of the present paper to study the ruled surfaces obtained by the repeated application of the# operation of forming the Jacobian from the quadratic forms θ and φ.
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