EntityQ2121952· pop 6· linked from 14 articlescircular points at infinitySign in to saveConnectionstranslationEntitycircleEntitycomplex numberEntityangleEntityreal numberEntityUniversity of MichiganEntityrotationEntitysystem of linear equationsEntityFelix KleinEntitynatural logarithmEntityprojective geometryEntityfixed pointEntitycross-ratioEntityalgebraic curveEntityhomogeneous coordinatesEntitypoint at infinityEntitytrilinear coordinatesEntityreal projective planeEntityDuncan SommervilleEntitycomplex projective planeEntityCategoriesComplex manifoldsInfinityProjective geometry