Susanne
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doc#105 alphabet begins with the letter A, instead of C , as in the scale. Because, like many other
doc#129 of any plane, <pgr>, meeting Q in a conic C , are transformed into the congruence of
doc#129 secants of the curve C<prime> into which C is transformed in the point involution
doc#129 involution on Q. In particular, tangents to C are transformed into tangents to C<prime>
doc#129 <formul> as directrices. </p><p> A conic, C , being a (1,1) curve on Q, meets the image
doc#129 met by the plane of the pencil in a curve, C , of order <formul>. On C there is a <formul>
doc#129 pencil in a curve, C, of order <formul>. On C there is a <formul> correspondence in which
doc#129 correspondence in which the <formul> points cut from C by a general line, l, of the pencil correspond
doc#129 of l and the plane of the pencil. Since C is rational, this correspondence has k
doc#129 this contradiction it is necessary that C be composite, with the secant of g and