On Certain Relations Between the Projective Theory of Surfaces and the Projective Theory of Congruences ... |
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2f+ log a₁ arbitrary constants axis B₁ B₂ Baker University Brussels Paper C₁ canonical form CIDENCES coincidence congruences coincidences d'd congruences characterized congruences which possess conjugate system const corresponding asymptotic curve d₁ d₁x differential equations directrix dr₂ E. J. Wilczynski eight lines exist congruences F₁ focal sheets focal surface FRANK EDWIN WOOD G₁ geometry of curved integrability conditions K₁ K₂ L₁ L₂ Let the coördinates linear complex log d³m² log FG M₁ M₂ mnc'd obtains osculating P₁ P₂ parametric curves point with respect possess the coincidences Projective differential geometry PROJECTIVE THEORY PROPERTIES AND CANONICAL S₁ S₂ second kind sub-group T₁ T₂ tangent plane tetrahedron theory of congruences tions transformation twelve coincidences twelve possible coincidences u₁ v₁ W-congruence whence x₁ δε δι λα λαμ λμ μπ бт ди диди นน