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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 |