The Shape of Space

SURFACES AND THREE-MANIFOLDS Flatland Gluing Vocabulary Orientability Connected Sums Products Flat Manifolds Orientability vs. Two-Sidedness GEOMETRIES ON SURFACES The Sphere The Hyperbolic Plane Geometries on Surfaces The Gauss-Bonnet Formula and the Euler Number GEOMETRIES ON THREE-MANIFOLDS Four-Dimensional Space The Hypersphere Hyperbolic Space Geometries on Three-Manifolds I Bundles Geometries on Three-Manifolds II THE UNIVERSE The Universe The History of Space Cosmic Crystallography Circles in the Sky Appendix A Answers Appendix B Bibliography Appendix C Conway's ZIP Proof Index