Susanne
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doc#129 of the given line . Thus pencils
doc#129 intersecting in a line l, tangent
doc#129 of as a line in a particular
doc#129 and hence every line of <formul> in
doc#129 obviously meets every line of <formul> in
doc#129 Clearly, any line , l,
doc#129 T. A line through two of
doc#129 image of any line of <formul>,
doc#129 , meets any line of <formul> in
doc#129 obviously meets any line <formul> in a
doc#129 that there exist line involutions of all
doc#129 show that every line which meets g
doc#129 by a general line , l,
doc#129 which implies a line of the pencil
doc#129 finally that every line through a point
doc#129 have a multiple line of multiplicity either
doc#129 there be a line through P which
doc#129 there be a line through P which
doc#129 secant and the line joining the vertex
doc#129 consider an arbitrary line , l,