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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 |