Abscissa and ordinate Abscissa and ordinate In mathematics, the abscissa (; plural "abscissae" or "abscissæ" or "abscissas") and the ordinate are respectively the first and second coordinate of a point in a coordinate system. The abscissa of a point is the signed measure of its projection on the primary axis, whose absolute value is the distance between the projection and the origin of the axis, and whose sign is given by the location on the projection relative to the origin (before: negative; after: positive). The ordinate of a point is the signed measure of its projection on the secondary axis, whose absolute value
Livingstone graph second action is equivalent to the standard action of PSL(2,11) on the projective line over F; the first is equivalent to an exceptional action on 11 points, related to the Paley biplane. Livingstone graph In the mathematical field of graph theory, the Livingstone graph is a distance-transitive graph with 266 vertices and 1463 edges. It is the largest distance-transitive graph with degree 11. The automorphism group of the Livingstone graph is the sporadic simple group J, and the stabiliser of a point is PSL(2,11). As the stabiliser is maximal in J, it acts primitively on the graph. As the Livingstone