This self-contained 2007 textbook presents an exposition of the well-known classical two-dimensional geometries, such as Euclidean, spherical, hyperbolic, and the locally Euclidean torus, and ...

K.-R. Biermann 7. Euler's mathematical notebooks E. Knobloch 8. On Euler's surviving manuscripts and notebooks G. P. Matvievskaya 9. The manuscript materials of Euler on number theory G. P.