## Involutorial Transformations ... |

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2)-fold point Annali di Mat applicazione arbitrarily chosen points Atti d. r. Accad basis points Bertini Berzolari birational coincident points conics and cubics Consider the involutorial Cornell University curve of coincident curve of degree curve of order determine eight double points eight fundamental points equation fixed curve formation four types fundamental curves corresponding geometrischen Verwandtschaften goes I2QP Invert involutorial transformation isolated invariant points Jacobian Journal of Mathematics let the points Lincei linear factors locus Martinetti nine double points nine points ninth double non-perspective Jonquieres transformation order six pencil of conics pencil of curves pencil of lines perspective Jonquieres transformation point of intersection point Q proper sextic quadratic transformation reduced simple points straight line tangent Transform by IpQR transformation in terms transformation of degree transformations of Class trasformazione piana doppia trasformazioni piane triangle of reference triple point V V V V Xlt X2