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| | lesson09.html |
 | | Any surface given by the equation q=0 belongs to one of the following 14 types: |
 | | ellipsoid, hyperboloid of one sheet, hyperboloid of two sheets, elliptic paraboloid, hyperbolic paraboloid, conic surface, elliptic cylinder, hyperbolic cylinder, parabolic cylinder, 2 intersecting planes, 2 parallel planes, 1 plane, 1 point and empty place. |
 | | The first 9 types are called non-degenerate, and they represent genuine curvilinear surfaces; the last 5 types are made up of straight-line objects. |
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