Title: On Centers and Central Lines of Triangles in the Elliptic Plane,
Abstract: We determine barycentric coordinates of triangle centers in the elliptic
plane. The main focus is put on centers that lie on lines whose euclidean limit
(triangle excess --> 0) is the Euler line or the Brocard line. We also
investigate curves which can serve in elliptic geometry as substitutes for the
euclidean nine-point-circle, the first Lemoine circle or the apollonian
circles.