Susanne
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doc#129 (1), the image of this pencil is a ruled surface of order <formul> which is met by the plane
doc#129 g as vertex is transformed into a ruled surface of order <formul> having <formul> generators
doc#129 generators concurrent at P. Since a ruled surface of order n with n concurrent generators
doc#129 <formul> curve on a nonsingular quadric surface . </p><p> We now observe that the case in
doc#129 that g is a <formul> curve on a quadric surface . </p><p> Continuing with the case in which