Contributions to the Theory of Conjugate Nets ... |
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American Journal analogous associate axis associate canonical quadric associate line associate ray pencil asymptotic auČ canonical plane canonical point canonical quadric touches characteristic line CONJUGATE NETS conjugate tangent coordinates are proportional coordinates proportional covariantly associated cuspidal quartic defined developable surfaces dinates equa equations 49 equations 50 flex-ray focal surfaces geometric interpretation given by h given conjugate harmonic conjugate intersects the ray Iowa Journal of Mathematics Lane line of collineation lines 11 local coordinates local tetrahedron log r)u minus-first Laplace transform ordinary space P₂ parametric conjugate pencil of lines plane at Px plane given plane with center point given point Px polar plane polars with respect pole and polar Projective Differential Geometry Px varies quadric of Lie quadric surface ray conic referred second canonical pencil second canonical tangent second-order contact tangent plane tions touches its envelope triple point University of Iowa Δυ