An elementary treatise on analytical geometry : embracing plane co-ordinate geometry, and an introduction to geometry of three dimensions (1869)
Johnson, William Woolsey, 1841-1927 · Philadelphia : J.B. Lippincott · leaf 205
ellipse in two imaginary points, because the direc-tions of the asymptotes become, in these cases, respectively coincident andimaginary, as shown in Art. 264. If the conies are concentric also, bothof the straight lines and all four of the intersections are at infinity. Com-pare Art. 133 and Note.…
Geometry, Analytic
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